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Please, don't try anything that you're about to see us do at home. Ever.

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Fire Liar pants on fire. You're not a thief, right? No. Good.

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When Carrie Grantontori embark on some crime and punishment to test mythical ways of beating the lie detector.

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Yes! Yes! Yes!

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Who are the misbusters? It's time to blow some stuff up!

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Adam Savage and Jamie Heineman.

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That was fun.

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Between them more than 30 years of special effects experience.

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This is the kind of thing I do on the weekend.

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Joining them, Carrie Byron.

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Come over here, you smell that?

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Grant Imahara.

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He's alive!

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And Tori Bellachy.

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This is starting to feel like a bad idea.

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They don't just tell them this, they put them to the test.

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Suck your gut in there, soldier. I detect a Civil War myth on the way.

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Sir, that's correct, sir! I'd like you to picture the following in your head.

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In the Civil War, the main thing they used for all their cannons and their guns was Blackpattern,

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but the Confederate Army was running on the Blackpattern towards the end of the Civil War

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and so decided to design a steam-powered machine gun, sir!

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Well, hold on a second. Haven't we already been down that road with steam cannons?

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They didn't work too well.

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Sir, that's correct! We did build a steam cannon, sir!

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But this is not a cannon powered by pressure!

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This is a machine gun powered centrifugally by a spinning disk that flings the projectile

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like a slingshot out of the gun that's up to us to build one, sir!

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Gee, that sounds like fun.

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Stand easy, Private Savage. There's a graphic coming.

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Modern machine guns work using explosive force to fire bullets at a rapid rate.

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But incredibly, this Civil War gun worked more like a slingshot.

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A slingshot uses centrifugal force to propel a projectile.

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Replace the sling with a barrel, an atom with a steam engine,

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and you've got yourself a mythical steam machine gun.

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You know, machine guns are complicated. This is going to be a tough build.

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Yeah, and right now there are way too many unknowns.

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We don't even know if this thing existed, let alone if there are any plans,

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if it was ever used in battle or if it was just some propaganda machine.

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Yeah, we can't just go inventing something. We need more information about it.

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More facts is what I've got for you, because the researchers have gotten us a Civil War expert,

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specifically on this gun. I'm going to go talk to him, find out what he knows,

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and that should give us a real leg up to getting started.

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Okay.

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Down at Fort Point in the foggy shadow of the Golden Gate Bridge,

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Adam meets Civil War weaponry expert John Lamb,

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who hasn't just heard of the mythical device, he's studied it.

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Tell me about this thing. Tell me everything. Tell me everything.

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The most important place to start is the one in Steam Gun. It did exist.

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It's a real device. It did exist.

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And he's brought along the original plans to prove there's nothing mythical about this gun,

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which begs the question,

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Now, can you tell me how it actually worked?

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The best way to describe it for you is a barrel with the opening at the top,

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and then it comes down in a curve and goes out like this.

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So as it turned around, it would snap one piece of shot out, keep going, do another.

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How lethal was this thing? And how fast could it fire?

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That's the big mystery.

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There are accounts saying it was tested and it seemed to be really deadly.

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There are others that say it never worked and nobody could prove it.

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So that's a big mystery.

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So now that Adam and Jamie know the gun existed, their task is to build it

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and get to the bottom of the disparate accounts of how effective it was.

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And back at HQ, they begin by brainstorming to bring the original plans back to life.

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You know, Adam, I think we need to break this down into the discrete parts.

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They finally get to grips with their mammoth task by boiling it down to four key components.

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The gun barrel.

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Okay, so the business end is a curved barrel there.

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Yeah.

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A method of feeding ammo into the gun.

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We're going to use a hollow axle to feed the ammo in.

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A motor to spin the gun barrel.

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The first thing that comes to mind for me is an air tool impeller.

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At easiest of all, steam to power the motor.

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Why don't we get a water heater?

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Which leaves just one question.

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What are we going to use for ammo?

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I think we should go with steel balls.

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This is going to be terrifying.

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Good. We've got a plan.

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I totally agree. Let's get to it.

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So after a category five brainstorm, the guys have a plan, which looks a lot like this.

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Two water heaters will generate steam, driving two motors.

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These in turn will spin the curved gun barrel at 2,000 RPM.

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A clockwork ammo feeder will drop the ball, and the centrifugal force will fling it out the barrel.

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At least, that's the theory.

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Because as this glimpse into the future confirms, this ballistic build will test the team's engineering skills to the limit.

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I've never heard anything like that.

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And provide another frightening example of just how dangerous being a myth buster can be.

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But all that's for later.

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First up is the spinning, flinging heart of the steam machine gun, the curved barrel.

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Unlike the Confederates, Jamie has access to some impressive 21st century technology.

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But throughout the process, the guys plan to stick to the Civil War specs.

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Well, so far so good. This is actually coming together quite nicely.

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I got to say, while it doesn't look like a gun barrel, it's actually really quite terrifying.

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Adam, check this out.

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So the bullet goes in there, and comes out here.

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It's working.

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That is so cool.

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Now imagine that spinning at 33 times a second.

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And you can see why this ballistic build is making everyone nervous.

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Yeah, I know it's fun. Let me get back to work.

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So, Carrie, have I ever told you that I sing in Adam's band the ginger tops twice a month?

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No.

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And also, he was voted in Germany the sexiest TV star, second only to David Hasselhoff.

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No.

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Have I told you that I was a small wookie in Star Wars Episode 3?

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No, you didn't because I would have seen you because I was a small wookie.

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Now you get it. We're lying. You know why?

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No.

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Because the fans have asked us to test out mythical ways to beat the polygraph machine.

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Once we're done with that, we're going to go up against the latest in lie detecting technology, the fMRI.

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Awesome. I haven't been this excited since my last cage match.

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Yeah, I want a rematch.

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Oh, and Lighty, the polygraph has been shrouded in controversy.

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Some say it's infallible, but the Mythbuster fansites are awash with claims it can be beat first time every time.

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Okay, mythical ways to beat the polygraph. How are we going to do this?

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Well, it sounds like there's two different ways to beat the polygraph machine.

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And that's physical and mental.

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Now the physical, you apply pain while you're telling the truth, whether you're biting on your tongue or stepping on a tack.

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So that way when you're telling the lie, it seems like you're relaxed and they think you're telling the truth.

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And the mental way is to think of very stressful thoughts while you are telling the truth.

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And when you tell a lie, you think of very happy thoughts.

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Well, we've used a polygraph before, but we are not remotely qualified to do it for something this serious.

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I think we need to find an expert, somebody who works with the police or the FBI or something.

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Well, we have a few friends in law enforcement. Let's go down to the South San Francisco PD and ask them for a few tips.

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So first up, it's off to the cop shop.

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Because if they're going to test techniques to beat the lie detector, they want to know the optimum conditions for a real polygraph test.

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Lieutenant Varney's recipe for polygraph success has four key ingredients.

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Two long hours in a sterile, distraction-free location cover the first two.

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The third issue is that is of bias. We really don't want the examiner to meet our subject before the test.

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So far so good, but it's the final factor that's the most critical of all.

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It needs to be a big lie. It needs to be a reward versus punishment aspect to it.

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If you wanted an accurate test of this, you would need to commit a crime.

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It slowly dawns on the guys. If they want to test this myth properly, they'll have to actually commit a crime.

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And that's because a lie detector works by measuring the physiological changes to the human body associated with stress, including heart rate, blood pressure and sweat.

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So committing a crime with consequences stressful enough to sweat over is the only way to really put the polygraph through its paces.

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Back at the shop, the team begin by building the interrogation chamber.

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But remember, if you can't do the time, don't do the mime.

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Despite the clowning around, following Lieutenant Varney's advice, they've soon got the perfect location for their lie detector tests,

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including the obligatory two-way mirror.

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You ever get the feeling people are watching us work? All the time.

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Coming up on Metsbusters, we make a scene with Steve God!

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During the Civil War, the Confederates spurred on by dwindling gunpowder stores designed and built a steam machine gun.

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But did it actually work? And what was it capable of?

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Questions Adam and Jamie intend to answer by building their very own steam machine gun.

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That is so cool.

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Jamie has completed the crucial curved gun barrel, and he's welded it into the heavy-duty frame.

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Oh, that's lovely.

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What they need now is a motor to drive it.

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This is an air impact wrench, and because we're making a steam machine gun, I figure a good place to start is to use an air impeller and an air motor.

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Driven by compressed air, it's perfect, because after they incorporate it into their design, it can simply replace the air with steam power.

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Adam cuts a steel safety collar. It encircles the barrel of the gun, ensuring the bullets can exit in just one direction.

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And that means the guys are on track. The barrel is spinning smoothly, and the motor is firing at the target speed.

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The next component in this beast of a build is Adam's ammo feeder.

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This right here is the clockwork that will pace out the bullets being dropped into the barrel.

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So this complicated clockwork design can be dialed to drop the ammo into the rotating barrel at just the right moment.

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If it works, the bullet will be flung with maximum speed and in the correct direction.

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This, it may look like a simple clockwork, but I think of it as a map of the most complex clockwork.

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I like the planets. It is not a planetary gear, but I think of it as a planetary gear, because each thing, like a planet, moves in its place and goes where it should.

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It is not only a map of the planets, it is also a map of the atom. In this vein, the microcosm is the macrocosm.

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And phylogeny recapitulates ontology. I call it my orary.

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After fighting his lost marbles, Adam adds his masterpiece to the rig.

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This is real. It's working now.

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Which means the guys are ready to put the steam into their steam machine gun.

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And for that, they'll need a household hot water heater, a plumbing necessity the guys recently discovered as the explosive potential of a bomb.

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If the pressure is kept below the failure point of 350 psi, they should be ideal to power the gun.

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There's a lot of energy in steam and in water heaters, and that's why we're going to use one for this job.

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Perfect. That ought to do.

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And with the last nut, bolt and ballistic shield in place, the guys are finally ready for a test fire.

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Alright, I'm putting in one of our target bullets.

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So Adam feeds the ammo feeder, Jamie hits the power, and the water heaters are on the boil.

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But as the tanks heat up and the pressure increases, an eerie hum rings out over M5.

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What do you think that is?

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I have a clue. It seems to be coming out of this one more though.

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The boys are baffled, and while they search for the sound source, the pressure and heat slowly but surely rise.

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We've got water at 260 some odd degrees. It's at 167 psi. It's a huge amount of energy.

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But with a whole heap of homemade plumbing involved, there's an element of doubt.

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That is so creepy.

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And Adam is feeling the pressure.

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Can we just go away from the steam and do only air pressure?

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At a complete loss as to the source of the mysterious sound, they open up a release valve to let off some steam.

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And to everyone's relief, the eerie end of the world humming stops.

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Cue a relieved, adrenaline-fueled Adam, waxing miracle about his industrial steam engineering, Breedler.

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Doing this, I feel a total kinship with the guys who invented this thing.

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This was made during the steam age. Steam was the power, and it is an incredible power.

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Counter-intuitively, after letting off all that steam, their prototype has maintained its pressure.

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And here's our resident steam lover to explain why.

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The moment we release pressure, all the water that isn't steam is being turned to steam to help keep that pressure up.

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It's very exciting. It's actually...

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Yeah, stop talking. What's the psi?

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171.

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Okay.

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With Adam doing his best kid in a candy store impression and the rig holding its pressure, the guys are finally ready to unleash the steam power and fire up their gun.

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Alright, so this is first test of Adam and Jamie's steam machine gun.

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With the team safely behind the ballistic shield, Adam remotely releases the ball.

196
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Incredibly, 100 years after it was designed, this steam powered gun works.

197
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What did it do to our...

198
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That worked beautifully. We're at 155 psi. I can see where it hit.

199
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Look at that.

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Is there a dent on the outside metal?

201
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Yes.

202
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It put a dent in a quarter inch of steel, and that means to me that if we get a tuned ride and the ball doesn't hit the steel, instead it comes out of the gun the way it's supposed to, it'd probably go through a person.

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So it is in fact lethal as it stands now.

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Despite a timing issue resulting in a slingshot firing into the safety collar and not through the gap, Adam and Jamie have a proof of concept.

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Nice. Very pleased and terrified.

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Next up, the team turned criminal.

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Wasn't you who stole that cash?

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No.

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And hit the polygraph hot seat.

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It's got the third degree.

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Last time the MythBusters played with a polygraph...

212
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Alright Grant, I got our guinea pig.

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They attempted to get in touch with a plant's feelings.

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But this time the team is tackling mythical techniques to beat the rap by perplexing the polygraph.

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But before the interrogation comes the crime, and Adam, our criminal mastermind has all the details.

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In these three envelopes I have a crime which two of you will commit and one will not.

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After handing over the sealed envelopes, Adam leaves the team to individually open their instructions.

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Burglar Balachy is first.

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00:17:43,000 --> 00:17:46,000
Alright, so here are the directions.

220
00:17:46,000 --> 00:17:51,000
Enter Jamie's office next to the computer on the top shelf of a tall white bookshelf.

221
00:17:51,000 --> 00:17:54,000
You will find a tanned cash box.

222
00:17:54,000 --> 00:17:56,000
Inside the box you will find a wallet.

223
00:17:56,000 --> 00:17:59,000
Open the wallet and remove $50.

224
00:17:59,000 --> 00:18:03,000
Grant is next and his task is identical to Tori's.

225
00:18:03,000 --> 00:18:09,000
And with the cash safely stashed, he slips away to spend his ill-gotten gains.

226
00:18:09,000 --> 00:18:11,000
Last up, Carrie.

227
00:18:11,000 --> 00:18:13,000
You are the innocent party.

228
00:18:13,000 --> 00:18:16,000
Carrie, do not search the room. Do not disturb anything.

229
00:18:16,000 --> 00:18:19,000
So Carrie is the all-important control.

230
00:18:19,000 --> 00:18:21,000
She didn't steal any cash.

231
00:18:21,000 --> 00:18:26,000
And during the interrogation, we'll answer all questions truthfully.

232
00:18:26,000 --> 00:18:30,000
Which means it's time to meet the man with the machine.

233
00:18:30,000 --> 00:18:38,000
Dr. Michael Martin has been a polygraphist for over 15 years and has conducted over 8,000 lie detection tests.

234
00:18:38,000 --> 00:18:42,000
There's a lot of people out there that think the polygraphs are total buck.

235
00:18:42,000 --> 00:18:44,000
How would you respond to that?

236
00:18:44,000 --> 00:18:46,000
Well, first of all, let's look at the research.

237
00:18:46,000 --> 00:18:54,000
The federal government has done quite a few studies and each study, the test results fall anywhere from about 80% to about 99% in accuracy.

238
00:18:54,000 --> 00:19:02,000
Before the guys test the reality of those impressive numbers, ringmaster Adam has one more trick up his sleeve.

239
00:19:02,000 --> 00:19:11,000
If you are able to conceal whether or not you did this crime from our polygraphist, the next time you fly for Mythbusters, you'll be flying first class.

240
00:19:11,000 --> 00:19:12,000
Yes!

241
00:19:12,000 --> 00:19:24,000
However, if you fail to conceal whether or not you did this crime from the polygraphist, you will be washing, waxing and polishing every single crew member's car on Mythbusters.

242
00:19:24,000 --> 00:19:28,000
This sucks. This went from fun to not fun.

243
00:19:28,000 --> 00:19:29,000
Yeah.

244
00:19:29,000 --> 00:19:34,000
With the threat of some real work hanging over their heads, the pressure is on.

245
00:19:34,000 --> 00:19:42,000
Burglar Bellachy will be the first to face the music, but how exactly will he attempt to outwit the polygraph?

246
00:19:42,000 --> 00:19:56,000
My secret weapon. I'm going to stick the tech in my pocket like this, point it at my leg and whenever I'm telling the truth, I'm just going to press down on my leg. It should hurt.

247
00:19:57,000 --> 00:20:14,000
Remember, the polygraph works by measuring the stress of lying. So the theory is, by stressing your body with pain on the truthful answers and relaxing on the lies, the machine can't tell the difference.

248
00:20:14,000 --> 00:20:20,000
To begin the test, Dr. Martin asks a bunch of simple calibration questions.

249
00:20:20,000 --> 00:20:22,000
Is your first name Salvatore?

250
00:20:22,000 --> 00:20:24,000
Yes.

251
00:20:24,000 --> 00:20:29,000
Remember, every time he answers truthfully, he presses in the tack.

252
00:20:29,000 --> 00:20:34,000
Did you steal that cash discovered missing from Jamie's office today?

253
00:20:34,000 --> 00:20:35,000
No.

254
00:20:35,000 --> 00:20:41,000
But the sensors on the seat and floor catch even the slightest suspicious movement.

255
00:20:41,000 --> 00:20:44,000
Okay, that's a movement. Please keep your eyes straight ahead.

256
00:20:44,000 --> 00:20:51,000
I tried going for the tack and he called me out, so I had to go straight to biting my tongue.

257
00:20:51,000 --> 00:20:56,000
So it's plan B. Torey's new, painful countermeasure is tongue biting.

258
00:20:56,000 --> 00:21:01,000
During your entire life, did you ever see anyone stolen from a cash fund or white envelope?

259
00:21:01,000 --> 00:21:03,000
Did you steal that cash?

260
00:21:03,000 --> 00:21:04,000
No.

261
00:21:04,000 --> 00:21:10,000
After a further 80 minutes of intense scrutiny and deliberately confusing questions.

262
00:21:10,000 --> 00:21:12,000
That's it. It's nice to meet you.

263
00:21:12,000 --> 00:21:14,000
Yeah, it's nice to meet you.

264
00:21:14,000 --> 00:21:18,000
Torey and his tongue finish the interrogation close to breaking point.

265
00:21:18,000 --> 00:21:20,000
He's got the third degree.

266
00:21:20,000 --> 00:21:23,000
I felt like the screws were being tightened down on me.

267
00:21:23,000 --> 00:21:28,000
Grant's next and for his technique, rather than getting physical, he's going mental.

268
00:21:28,000 --> 00:21:37,000
My happy slash erotic thoughts are puppies licking my face and scantily clad women.

269
00:21:37,000 --> 00:21:39,000
Okay.

270
00:21:39,000 --> 00:21:43,000
So Grant will use the power of his not inconsiderable mind.

271
00:21:43,000 --> 00:21:50,000
By thinking stressful thoughts of getting caught when being honest and happy thoughts when lying,

272
00:21:50,000 --> 00:21:53,000
the test results are supposedly rendered inconclusive.

273
00:21:53,000 --> 00:22:01,000
Regarding that cash report, did you ever break the question, did you who stole that cash?

274
00:22:01,000 --> 00:22:02,000
No.

275
00:22:02,000 --> 00:22:07,000
Grant's technique requires absolute focus and concentration.

276
00:22:07,000 --> 00:22:08,000
No.

277
00:22:08,000 --> 00:22:14,000
But the intensity and length of the interview are designed to counter Grant's countermeasure.

278
00:22:14,000 --> 00:22:15,000
Come here.

279
00:22:15,000 --> 00:22:17,000
That's going to do it.

280
00:22:19,000 --> 00:22:22,000
Last up is innocent little Carrie.

281
00:22:22,000 --> 00:22:27,000
I don't like people throwing unexpected questions at me like that.

282
00:22:27,000 --> 00:22:31,000
I've seen Montell. I know how they take people off guard.

283
00:22:31,000 --> 00:22:33,000
Is your first name Carrie?

284
00:22:33,000 --> 00:22:34,000
Yes.

285
00:22:34,000 --> 00:22:36,000
Here's the question.

286
00:22:36,000 --> 00:22:39,000
She's the control and didn't steal any cash.

287
00:22:39,000 --> 00:22:45,000
But despite her innocence, the stressful environment and questioning takes its toll.

288
00:22:45,000 --> 00:22:47,000
Was that money stolen from a white envelope?

289
00:22:47,000 --> 00:22:48,000
Jenny's chair.

290
00:22:48,000 --> 00:22:50,000
The cash reported missing from Jamie.

291
00:22:50,000 --> 00:22:54,000
I was waiting for that moment where I was going to break down.

292
00:22:54,000 --> 00:22:55,000
No.

293
00:22:55,000 --> 00:23:01,000
The question is, will her nerves confuse the polygraph and lead to a false accusation?

294
00:23:01,000 --> 00:23:03,000
That's the worst.

295
00:23:03,000 --> 00:23:07,000
Find out exactly who will be charged with the crime and who won't.

296
00:23:07,000 --> 00:23:11,000
Dr. Martin gathers the suspects for the results.

297
00:23:11,000 --> 00:23:14,000
Well, first of all, the good news is that no one's test was inconclusive.

298
00:23:14,000 --> 00:23:16,000
We have conclusive results on everyone.

299
00:23:16,000 --> 00:23:17,000
Really?

300
00:23:17,000 --> 00:23:18,000
Absolutely.

301
00:23:18,000 --> 00:23:19,000
Great.

302
00:23:19,000 --> 00:23:22,000
Later, crime and punishment takes its toll.

303
00:23:22,000 --> 00:23:24,000
This is not funny anymore.

304
00:23:24,000 --> 00:23:29,000
But first, the guys get fired up with the steam machine gun.

305
00:23:29,000 --> 00:23:32,000
Actually fired for the first time out in the wild.

306
00:23:32,000 --> 00:23:33,000
Let's go.

307
00:23:42,000 --> 00:23:46,000
Adam and Jamie are involved in a steamy affair.

308
00:23:46,000 --> 00:23:49,000
Working on these machines is great for my stand.

309
00:23:49,000 --> 00:23:56,000
Using the Civil War specs and modern materials, they've built a steam powered machine gun.

310
00:23:56,000 --> 00:24:01,000
It may not look like it, but it's working.

311
00:24:01,000 --> 00:24:10,000
With Jamie drawing the line at firing automatic weapons in the shop, it's off to the wide open spaces of the Alameda runway.

312
00:24:10,000 --> 00:24:15,000
Here, the team will tackle the central unresolved question of this myth.

313
00:24:15,000 --> 00:24:19,000
Did it function effectively as a weapon of war?

314
00:24:19,000 --> 00:24:20,000
That's it.

315
00:24:26,000 --> 00:24:29,000
There are a lot of conflicting stories about this machine gun.

316
00:24:29,000 --> 00:24:30,000
Absolutely.

317
00:24:30,000 --> 00:24:34,000
We have reports of it firing distances between 100 yards and 300 yards.

318
00:24:34,000 --> 00:24:39,000
We have reports of it firing 200 rounds a minute, 300 rounds a minute, 400 rounds a minute.

319
00:24:39,000 --> 00:24:45,000
And we have Corporal James Whitaker's account that balls the size of a walnut's cut a target completely in twain.

320
00:24:45,000 --> 00:24:51,000
To test these conflicting reports, Adam and Jamie will use these three standards.

321
00:24:51,000 --> 00:24:58,000
A range of 300 yards, a rapid fire capability of 400 rounds per minute, and of course, lethal force.

322
00:24:59,000 --> 00:25:03,000
Past these best case scenarios, and it's myth confirmed.

323
00:25:03,000 --> 00:25:10,000
With an eye on the range test, Adam marks out 800 yards of runway with a series of 2x4s.

324
00:25:10,000 --> 00:25:14,000
And with everything plumbed in, they put the water heaters on to boil.

325
00:25:14,000 --> 00:25:16,000
Ha! That's it.

326
00:25:16,000 --> 00:25:20,000
And the heat and pressure head rapidly for the butter zone.

327
00:25:20,000 --> 00:25:24,000
We've got a tachometer set up so we know exactly when it reaches 2000 RPM.

328
00:25:24,000 --> 00:25:30,000
We've got the pin on pull, drop the ball in, and we're going to see this thing actually fire for the first time out in the wild.

329
00:25:30,000 --> 00:25:31,000
Let's go.

330
00:25:31,000 --> 00:25:37,000
This is it. The mythbusters are about to fire a single round from their steam powered gun.

331
00:25:37,000 --> 00:25:43,000
Here we go. We should hear it clang. The second light pole is three, two, one.

332
00:25:45,000 --> 00:25:49,000
That was it. It happened a little bit later.

333
00:25:50,000 --> 00:25:55,000
Just like the proof of concept test back at M5, there seems to be a timing problem.

334
00:25:57,000 --> 00:25:58,000
Can you see the mark?

335
00:25:58,000 --> 00:26:00,000
I can. There's a new mark.

336
00:26:01,000 --> 00:26:04,000
The bullet is hitting the collar and not firing through the gap.

337
00:26:05,000 --> 00:26:07,000
I don't know what the heck we're going to do about that.

338
00:26:07,000 --> 00:26:11,000
I don't know what to do about that except line up five balls and see what happens when I drop them all.

339
00:26:11,000 --> 00:26:15,000
Maybe they'll all whoop, whoop, whoop, just let each other go. What do you think?

340
00:26:15,000 --> 00:26:18,000
Want to try that one? Let's try that one.

341
00:26:18,000 --> 00:26:24,000
It's a ballsy plan that has Adam bouncing around like a cartoon character on caffeine.

342
00:26:24,000 --> 00:26:27,000
A test fire with multiple rounds.

343
00:26:27,000 --> 00:26:28,000
Let's fire this puppy.

344
00:26:31,000 --> 00:26:34,000
My detection is no laughing matter.

345
00:26:34,000 --> 00:26:39,000
If you want to find out more about polygraph machine, go to discovery.

346
00:26:39,000 --> 00:26:42,000
Come play with me, the Busters.

347
00:26:42,000 --> 00:26:46,000
Okay. I'll tell you whatever you want to know.

348
00:26:47,000 --> 00:26:53,000
Our fun loving criminals have been testing mythical ways to beat the polygraph and the results are in.

349
00:26:53,000 --> 00:26:56,000
The good news is that no one's test was inconclusive.

350
00:26:56,000 --> 00:27:03,000
Remember, Grant and Tori are guilty and tried to invalidate the test with two different countermeasures.

351
00:27:03,000 --> 00:27:05,000
The screws are being tightened down on me.

352
00:27:05,000 --> 00:27:09,000
But Carrie was innocent. So did Dr. Martin pick it.

353
00:27:09,000 --> 00:27:15,000
Carrie, you were found not to be involved in the theft. Your test was truthful and honest.

354
00:27:15,000 --> 00:27:20,000
Unfortunately, the men's test didn't go as well. They both failed clearly.

355
00:27:20,000 --> 00:27:24,000
Wow, really? I knew I failed.

356
00:27:24,000 --> 00:27:31,000
The numbers don't lie. Both our crims scored a probability of guilt greater than 99%.

357
00:27:31,000 --> 00:27:37,000
Dr. Martin had no problems spotting Tori's attempt to mask his responses with pain.

358
00:27:37,000 --> 00:27:43,000
As for Grant, in your particular case, it was your skin glands were the most telling.

359
00:27:43,000 --> 00:27:46,000
You just couldn't suppress it. There's no way you could do that.

360
00:27:46,000 --> 00:27:50,000
You didn't have a chance. I'm not cut out for crime. What can I say?

361
00:27:50,000 --> 00:27:53,000
Quite simply, the boys didn't have a chance.

362
00:27:53,000 --> 00:28:00,000
Modern polygraphs, when used by experienced polygraphers, are very effective. The trick questions.

363
00:28:00,000 --> 00:28:03,000
During your entire life, did you ever break the law?

364
00:28:03,000 --> 00:28:11,000
The intimidating atmosphere and myriad of sensors mean they are very, very difficult to beat.

365
00:28:12,000 --> 00:28:19,000
Which means it's time for the boys to make like an 80's disco diva and hit the car wash.

366
00:28:19,000 --> 00:28:22,000
I didn't bring my bikini, did you bring yours?

367
00:28:28,000 --> 00:28:32,000
It's totally ridiculous. And the producers are.

368
00:28:33,000 --> 00:28:37,000
So much for beating the polygraph machine. We both failed.

369
00:28:37,000 --> 00:28:39,000
At least all the cars are clean.

370
00:28:39,000 --> 00:28:45,000
That's funny. You know what though, there is one other system of lie detecting that I think we need to test.

371
00:28:45,000 --> 00:28:50,000
They actually use brain mapping to tell whether or not you're lying. And they say it's 90% accurate.

372
00:28:50,000 --> 00:28:57,000
Yeah, actually I've heard of that. They use an fMRI and they can actually see the part of your brain that's used for lying.

373
00:28:57,000 --> 00:29:01,000
So this is less about myth busting and more about the science of lying.

374
00:29:01,000 --> 00:29:06,000
And to uncover the science of lying, they have to do some flying.

375
00:29:06,000 --> 00:29:12,000
The medical university of South Carolina is at the cutting edge of this new lie detection technology.

376
00:29:12,000 --> 00:29:15,000
Anybody know where the hell we're going?

377
00:29:15,000 --> 00:29:19,000
Whereas Grant and Tori are at the cutting edge of getting lost.

378
00:29:19,000 --> 00:29:24,000
We are looking for the medical university of South Carolina.

379
00:29:24,000 --> 00:29:28,000
Finally inside, Carrie gets to meet expert Dr. Frank Kozell.

380
00:29:28,000 --> 00:29:32,000
So the fMRI is new technology for a lie detector.

381
00:29:32,000 --> 00:29:38,000
Correct, Carrie. We've been working on this for a while and we're looking at using fMRI to measure in the brain when people are lying.

382
00:29:38,000 --> 00:29:39,000
So how's it work?

383
00:29:39,000 --> 00:29:42,000
We think that when people are lying, their brains are working harder.

384
00:29:42,000 --> 00:29:47,000
And so we can measure the differences in blood flow and tell when people are lying versus telling the truth.

385
00:29:47,000 --> 00:29:54,000
According to Adam, in order for this test to have the proper motivation that it needs, there's going to be a reward and a punishment.

386
00:29:54,000 --> 00:30:00,000
If you're able to successfully beat the test, you get the reward of $1,000.

387
00:30:01,000 --> 00:30:02,000
Are you kidding me?

388
00:30:02,000 --> 00:30:03,000
What?

389
00:30:03,000 --> 00:30:04,000
That's pretty good.

390
00:30:04,000 --> 00:30:10,000
However, if you're not able to successfully beat the test, you get to take a bus back to San Francisco.

391
00:30:10,000 --> 00:30:11,000
What?

392
00:30:15,000 --> 00:30:16,000
That sucks.

393
00:30:16,000 --> 00:30:17,000
A bus?

394
00:30:17,000 --> 00:30:18,000
That sucks!

395
00:30:18,000 --> 00:30:21,000
Have you ever ridden the bus long distances?

396
00:30:21,000 --> 00:30:24,000
Are you serious? This is not funny anymore.

397
00:30:24,000 --> 00:30:33,000
In the course of Mythbusters, Tori has been dragged along the ground by a horse and face planted on a bike.

398
00:30:35,000 --> 00:30:39,000
But could this be the myth that breaks Tori's back?

399
00:30:41,000 --> 00:30:43,000
I don't want to take this test.

400
00:30:43,000 --> 00:30:46,000
Can I opt to not take the test?

401
00:30:46,000 --> 00:30:49,000
After the break, Adam and Jamie turn up the heat.

402
00:30:49,000 --> 00:30:51,000
I think he's dead.

403
00:30:52,000 --> 00:30:56,000
And the team is scanned to within an inch of their lives.

404
00:30:56,000 --> 00:30:58,000
This is not going to rip my feelings out, is it?

405
00:31:06,000 --> 00:31:14,000
Adam and Jamie are in a spin testing claims that a Civil War-era steam machine gun was a lethal weapon.

406
00:31:14,000 --> 00:31:16,000
That was it!

407
00:31:16,000 --> 00:31:24,000
With range and rapid fire capability, but so far the only target in danger is the steel safety collar.

408
00:31:24,000 --> 00:31:26,000
I don't know what the heck we're going to do about that.

409
00:31:26,000 --> 00:31:28,000
Their solution? More ammo.

410
00:31:28,000 --> 00:31:31,000
Want to try that one? Let's try that one.

411
00:31:31,000 --> 00:31:37,000
So the guys are hoping the timing issue resolves itself under the weight of multiple rounds.

412
00:31:37,000 --> 00:31:41,000
The victims are these foam board figures.

413
00:31:41,000 --> 00:31:44,000
A place of about 20 feet from the barrel of our steam machine gun.

414
00:31:44,000 --> 00:31:49,000
For this test, the guys will attempt to fire five bullets in quick succession.

415
00:31:49,000 --> 00:31:51,000
Ready when you are.

416
00:31:51,000 --> 00:31:56,000
And if successful, will it match the mythical reports of 400 rounds per minute?

417
00:31:57,000 --> 00:32:00,000
Alright, here we go. Three, two, one!

418
00:32:04,000 --> 00:32:06,000
We hit the figures!

419
00:32:08,000 --> 00:32:11,000
No wonder Adam's happy. They hit their target.

420
00:32:12,000 --> 00:32:17,000
And the use of multiple rounds seems to have solved that timing problem.

421
00:32:17,000 --> 00:32:20,000
One, two, three, four, five!

422
00:32:20,000 --> 00:32:21,000
You know what?

423
00:32:21,000 --> 00:32:22,000
What?

424
00:32:22,000 --> 00:32:24,000
That is a machine gun.

425
00:32:24,000 --> 00:32:28,000
Yep, with the five rounds leaving the gun in approximately one second,

426
00:32:28,000 --> 00:32:32,000
they're close enough to the mythical specs to get a pass mark.

427
00:32:32,000 --> 00:32:37,000
Next, Adam and Jamie want to know if those rapid fire rounds can kill.

428
00:32:38,000 --> 00:32:42,000
And for that, they'll need a ye olde control.

429
00:32:42,000 --> 00:32:46,000
I just want to do a comparison shot with a black powder rifle into the Ballistics Gel Guy.

430
00:32:46,000 --> 00:32:49,000
And then fire our steam machine gun and see how the two compare.

431
00:32:49,000 --> 00:32:53,000
Adam sets his sights on the Ballistics material bust.

432
00:32:53,000 --> 00:32:57,000
And three, two, one!

433
00:32:58,000 --> 00:33:00,000
He didn't stand a chance.

434
00:33:02,000 --> 00:33:04,000
I think he's dead.

435
00:33:05,000 --> 00:33:08,000
They went right through him and through the board.

436
00:33:09,000 --> 00:33:11,000
There's no doubt about it.

437
00:33:11,000 --> 00:33:15,000
The period accurate black powder rifle packs a deadly punch.

438
00:33:16,000 --> 00:33:19,000
So that's what the guys are expecting from their machine gun.

439
00:33:19,000 --> 00:33:23,000
Let's try three balls this time. Bang, bang and bang.

440
00:33:26,000 --> 00:33:30,000
Alright, let's leave the ball these tests in three, two, one!

441
00:33:34,000 --> 00:33:36,000
That's great!

442
00:33:36,000 --> 00:33:41,000
Bang, bang and bang was exactly what the Ballistics bust got.

443
00:33:42,000 --> 00:33:45,000
But was it, as per the myth, lethal?

444
00:33:45,000 --> 00:33:47,000
I gotta say, I think that's a kill man.

445
00:33:47,000 --> 00:33:52,000
It's not quite all the way through the man in the plywood, but it's definitely under the skin.

446
00:33:52,000 --> 00:33:53,000
I agree.

447
00:33:53,000 --> 00:33:57,000
Yep, and a look at the high speed gives Adam and Jamie a visual confirmation

448
00:33:57,000 --> 00:34:03,000
that a point blank range staring down the spinning barrel of this gun is fatal.

449
00:34:04,000 --> 00:34:05,000
Yes!

450
00:34:06,000 --> 00:34:07,000
Isn't that awesome?

451
00:34:08,000 --> 00:34:15,000
So far so good for the myth, but to be sure, we need a more realistic flesh and bone target.

452
00:34:34,000 --> 00:34:41,000
The idea here is that I need to either steal the watch or the ring from this drawer.

453
00:34:41,000 --> 00:34:47,000
And I need to take whichever object I choose, put it in my locker with all of my belongings,

454
00:34:47,000 --> 00:34:52,000
then I'll go into fMRI and they're going to ask me a series of questions about which item I took

455
00:34:52,000 --> 00:34:54,000
and some baseline truth and lie questions.

456
00:34:54,000 --> 00:34:57,000
I'm going to steal the ring.

457
00:34:57,000 --> 00:34:59,000
I'm going to steal the ring.

458
00:34:59,000 --> 00:35:06,000
With the ring stashed safely among Carrie's belongings, she heads for the MRI,

459
00:35:06,000 --> 00:35:09,000
where she's prepped for her futuristic interview.

460
00:35:09,000 --> 00:35:11,000
This is an intense.

461
00:35:11,000 --> 00:35:16,000
The questions appear on a screen and Carrie answers with the press of a button.

462
00:35:16,000 --> 00:35:19,000
Just try to keep your head as still as possible, okay?

463
00:35:19,000 --> 00:35:24,000
Carrie's attempt to beat this lie detector involves thinking happy, relaxing thoughts

464
00:35:24,000 --> 00:35:29,000
when lying and scary thoughts on the truth.

465
00:35:29,000 --> 00:35:33,000
But can you fool a machine looking directly at your brain?

466
00:35:33,000 --> 00:35:37,000
Next up is Tori and he's also taking the ring.

467
00:35:37,000 --> 00:35:39,000
I'm going to go with the ring.

468
00:35:39,000 --> 00:35:45,000
After safely stowing his booty in his locker, he's ready for the Mythbusters Magnetron.

469
00:35:45,000 --> 00:35:48,000
I'm on clear metal. This is not going to rip my feelings out, is it?

470
00:35:48,000 --> 00:35:49,000
No.

471
00:35:49,000 --> 00:35:55,000
Tori's attempt to beat the mind machine involves the same mind game as Carrie.

472
00:35:55,000 --> 00:36:00,000
And after answering the question, he escapes with his feelings intact.

473
00:36:00,000 --> 00:36:03,000
Last but not least is Grant.

474
00:36:03,000 --> 00:36:08,000
Okay, so I've chosen to take the watch and I don't know why.

475
00:36:08,000 --> 00:36:12,000
It's just shiny and look like something fun to take.

476
00:36:12,000 --> 00:36:16,000
With Grant's shiny eyes, he's trying to get the ring out.

477
00:36:16,000 --> 00:36:18,000
It looks like something fun to take.

478
00:36:18,000 --> 00:36:23,000
With Grant's shiny secret under wraps, he too heads into the donut of doom.

479
00:36:23,000 --> 00:36:30,000
Now my technique for beating the FMRI is to put my brain in a state of constant activity.

480
00:36:30,000 --> 00:36:35,000
And I'm actually going to psychologically create for myself a feeling of fear,

481
00:36:35,000 --> 00:36:40,000
hoping to stimulate the blood flow all around my brain so that they won't know

482
00:36:40,000 --> 00:36:43,000
when I'm lying or when I'm telling the truth.

483
00:36:43,000 --> 00:36:50,000
So the sci-fi cross-examinations are complete and the technicians begin to sift through the scans.

484
00:36:50,000 --> 00:36:55,000
Remember, if our thieves are successful in confusing the test,

485
00:36:55,000 --> 00:36:59,000
they get a thousand bucks and avoid a long bus ride home.

486
00:36:59,000 --> 00:37:04,000
We found that all three of you took the ring.

487
00:37:04,000 --> 00:37:06,000
Yes! Yes! Yes!

488
00:37:06,000 --> 00:37:10,000
As you can tell by the reactions, Grant beat the MRI.

489
00:37:10,000 --> 00:37:12,000
Carrie and Tori didn't.

490
00:37:12,000 --> 00:37:18,000
Well, it looks like we get to take that cross-country trip we've been talking about for so long.

491
00:37:21,000 --> 00:37:23,000
Oh well, what are you going to do?

492
00:37:28,000 --> 00:37:34,000
Grant's smug, Carrie's cursing and refusing to even talk to the producer.

493
00:37:34,000 --> 00:37:36,000
I'm not speaking to you.

494
00:37:36,000 --> 00:37:39,000
I can't believe Grant beat that freaking test though.

495
00:37:39,000 --> 00:37:41,000
That's unbelievable.

496
00:37:41,000 --> 00:37:44,000
I'm not speaking to Adam.

497
00:37:44,000 --> 00:37:47,000
I might forgive you, but not for the next two days.

498
00:37:47,000 --> 00:37:50,000
Okay guys, here's your tickets.

499
00:37:52,000 --> 00:37:54,000
Holy crap!

500
00:37:54,000 --> 00:37:57,000
3,077 miles.

501
00:38:01,000 --> 00:38:04,000
Myths about lie detectors, where do we stand?

502
00:38:04,000 --> 00:38:06,000
Where's the polygraph goes?

503
00:38:06,000 --> 00:38:10,000
The physical and mental techniques of the two you guys utilized failed pretty miserably.

504
00:38:10,000 --> 00:38:13,000
But just because you guys didn't do it doesn't mean somebody else can't.

505
00:38:13,000 --> 00:38:15,000
So we're going to have to call this one plausible.

506
00:38:15,000 --> 00:38:17,000
How is that bus ride, by the way?

507
00:38:17,000 --> 00:38:19,000
Shut up.

508
00:38:35,000 --> 00:38:47,000
Adam and Jamie are attempting to resolve the controversy that a Civil War steam machine gun was an effective weapon of war.

509
00:38:47,000 --> 00:38:51,000
It's already been proved lethal at close range.

510
00:38:51,000 --> 00:38:52,000
Isn't that awesome?

511
00:38:52,000 --> 00:38:59,000
But how will it fare at 20 yards with a more realistic target? Cue the human analog.

512
00:38:59,000 --> 00:39:02,000
The steam machine gun's about to claim its next victim.

513
00:39:02,000 --> 00:39:06,000
The ballistic gel is nice, but I want to see what happens in real flesh.

514
00:39:06,000 --> 00:39:10,000
Surrounded by the foam regiment, Porky is in Adam's sights.

515
00:39:10,000 --> 00:39:14,000
Alright, shoot the big in three, two, one.

516
00:39:20,000 --> 00:39:22,000
The gun again performed.

517
00:39:22,000 --> 00:39:26,000
But did our poor sign test target survive?

518
00:39:26,000 --> 00:39:29,000
It looks like one glad stalled for them and went through here.

519
00:39:29,000 --> 00:39:31,000
We got a hit right there.

520
00:39:31,000 --> 00:39:33,000
That probably broke some bones though.

521
00:39:33,000 --> 00:39:38,000
Yeah, but that's not a lethal hit. That's no penetration.

522
00:39:38,000 --> 00:39:48,000
So Porky was pummeled, but with not so much as a flesh wound, the claim that the steam machine gun was a lethal weapon of war is looking busted.

523
00:39:48,000 --> 00:39:50,000
I just don't think it can kill.

524
00:39:50,000 --> 00:39:53,000
That's really where the rubber meets the road with a weapon of war.

525
00:39:53,000 --> 00:39:56,000
And you don't want to just...dent the enemy.

526
00:39:56,000 --> 00:39:58,000
I want to kill them.

527
00:39:58,000 --> 00:40:03,000
So unless you're standing right at the end of the barrel, it's not a deadly weapon.

528
00:40:03,000 --> 00:40:10,000
But Adam and Jamie want to try all the angles before consigning their steam machine to the busted bin.

529
00:40:10,000 --> 00:40:14,000
They're going to test the full extent of the gun's range.

530
00:40:14,000 --> 00:40:16,000
We're now going for real distance.

531
00:40:16,000 --> 00:40:21,000
So we've angled our cannon at the steepest angle we're comfortable with, about 20 degrees,

532
00:40:21,000 --> 00:40:27,000
which tells me it ought to fire around 500 yards, and we're going to actually test this out and see.

533
00:40:27,000 --> 00:40:32,000
It's full steam ahead for the range test, and Adam amps up the ammo.

534
00:40:32,000 --> 00:40:33,000
12.

535
00:40:35,000 --> 00:40:37,000
The gun's locked and loaded.

536
00:40:37,000 --> 00:40:39,000
Everybody, we're going high.

537
00:40:39,000 --> 00:40:44,000
And Adam, keeping his Hollywood action hero dream alive, gets into character.

538
00:40:44,000 --> 00:40:48,000
This one's for distance and for glory.

539
00:40:50,000 --> 00:40:53,000
With the gun at full speed, Adam releases his balls.

540
00:40:54,000 --> 00:40:58,000
But the rig ain't happy and chaos reigns.

541
00:40:58,000 --> 00:41:04,000
Jamie kills the steam on his side and frantically signals for Adam to do the same.

542
00:41:04,000 --> 00:41:12,000
But with a machine gun spiraling out of control at 2,000 RPM, Adam's taking no chances.

543
00:41:14,000 --> 00:41:18,000
He reaches around the ballistic shield and finally shuts it down.

544
00:41:19,000 --> 00:41:22,000
I think that might be the last thing our cannon does.

545
00:41:22,000 --> 00:41:26,000
But as this high speed shows, it wasn't in vain.

546
00:41:26,000 --> 00:41:28,000
My God, what a beautiful shot.

547
00:41:28,000 --> 00:41:33,000
So at least one bullet left the barrel before the shutdown.

548
00:41:33,000 --> 00:41:35,000
But where'd it go?

549
00:41:35,000 --> 00:41:37,000
You got one.

550
00:41:37,000 --> 00:41:38,000
700 yards.

551
00:41:38,000 --> 00:41:39,000
No.

552
00:41:39,000 --> 00:41:42,000
Dude, that's just under half a mile.

553
00:41:42,000 --> 00:41:44,000
That is really nice work, man.

554
00:41:44,000 --> 00:41:51,000
Yep, unexpectedly, the gun fired a full 300 yards further than the Civil War specs,

555
00:41:51,000 --> 00:41:55,000
which leaves the myth scorecard looking like this.

556
00:41:55,000 --> 00:42:00,000
But if you add a crucial fourth category, it's not nearly as impressive.

557
00:42:00,000 --> 00:42:01,000
A dead hit.

558
00:42:01,000 --> 00:42:02,000
Soldier.

559
00:42:02,000 --> 00:42:04,000
Sir, yes, sir.

560
00:42:04,000 --> 00:42:06,000
What do you think of the steam machine gun as a machine?

561
00:42:06,000 --> 00:42:11,000
Sir, it functions effectively as both a machine and a gun, sir.

562
00:42:11,000 --> 00:42:12,000
Soldier.

563
00:42:12,000 --> 00:42:13,000
Sir, yes, sir.

564
00:42:13,000 --> 00:42:16,000
What do you think of the steam machine gun as a weapon of war?

565
00:42:16,000 --> 00:42:20,000
Sir, it's not very effective, sir.

566
00:42:20,000 --> 00:42:22,000
Okay, let's get out of here.

567
00:42:32,000 --> 00:42:34,000
Permission to speak fairly, sir.

568
00:42:34,000 --> 00:42:35,000
Permission granted.

569
00:42:35,000 --> 00:42:39,000
Sir, we are about to egg-bore gun a viewer special, sir.

570
00:42:39,000 --> 00:42:40,000
And?

571
00:42:40,000 --> 00:42:45,000
Major, one to contribute their ideas should log on to Discovery.com.

572
00:42:45,000 --> 00:42:48,000
Sir, nice work, soldier.

573
00:42:48,000 --> 00:42:50,000
Now drop and give me 20.