1 00:00:06,740 --> 00:00:03,740 why do you sometimes see unburnt trees 2 00:00:08,450 --> 00:00:06,750 next to a burnt down house conspiracy 3 00:00:10,070 --> 00:00:08,460 theorists would say that is because the 4 00:00:12,560 --> 00:00:10,080 houses were actually vaporized with 5 00:00:14,209 --> 00:00:12,570 beams of energy from space but the 6 00:00:16,369 --> 00:00:14,219 actual reason as many people have 7 00:00:18,200 --> 00:00:16,379 pointed out is simply that the wood in 8 00:00:20,359 --> 00:00:18,210 the houses is dry and the wood in the 9 00:00:22,220 --> 00:00:20,369 trees is wet now if you don't have a 10 00:00:24,349 --> 00:00:22,230 ward fire in your house this might be a 11 00:00:26,900 --> 00:00:24,359 bit hard to understand so I set out to 12 00:00:28,550 --> 00:00:26,910 do an experiment to demonstrate this the 13 00:00:30,470 --> 00:00:28,560 first stop was my attic which like most 14 00:00:32,690 --> 00:00:30,480 new houses in California has an internal 15 00:00:34,280 --> 00:00:32,700 frame of two-by-fours there was a bit of 16 00:00:36,500 --> 00:00:34,290 scrap wood leftover from construction 17 00:00:38,330 --> 00:00:36,510 this was the same wood as the frame of 18 00:00:40,700 --> 00:00:38,340 my house so it was ideal for testing and 19 00:00:43,100 --> 00:00:40,710 then went out back to chop a live branch 20 00:00:44,840 --> 00:00:43,110 off a live tree and then chopped both 21 00:00:48,770 --> 00:00:44,850 the attic wood and the live wood into 22 00:00:50,630 --> 00:00:48,780 pieces about the same size when I 23 00:00:53,240 --> 00:00:50,640 weighed the acid water came out at about 24 00:00:57,020 --> 00:00:53,250 a pound and a quarter I then weighed the 25 00:00:58,939 --> 00:00:57,030 same sized piece of tree wood and it 26 00:01:00,139 --> 00:00:58,949 came out to be nearly twice as much most 27 00:01:02,990 --> 00:01:00,149 of that extra weight is coming from 28 00:01:04,640 --> 00:01:03,000 water and then built a symmetrical fire 29 00:01:06,260 --> 00:01:04,650 from kindling and put the live wood on 30 00:01:08,510 --> 00:01:06,270 the left and the acid wood on the right 31 00:01:10,460 --> 00:01:08,520 I lit the fire and fed it more kindling 32 00:01:12,469 --> 00:01:10,470 when he went out it was very obvious 33 00:01:14,510 --> 00:01:12,479 during the process that the live wood 34 00:01:15,830 --> 00:01:14,520 never caught on fire whereas the attic 35 00:01:18,200 --> 00:01:15,840 ward started burning almost straight 36 00:01:19,429 --> 00:01:18,210 away if you look at the twigs and the 37 00:01:22,219 --> 00:01:19,439 lead in the back you see they do 38 00:01:25,969 --> 00:01:22,229 actually flare up at one point but most 39 00:01:28,399 --> 00:01:25,979 of the live wood remained unburned the 40 00:01:29,870 --> 00:01:28,409 attic wood on the other hand was on fire 41 00:01:31,810 --> 00:01:29,880 for several minutes and was charred 42 00:01:34,670 --> 00:01:31,820 partway through 43 00:01:36,590 --> 00:01:34,680 in fact when I chopped the two pieces of 44 00:01:41,149 --> 00:01:36,600 wood in half you could see that the dry 45 00:01:43,010 --> 00:01:41,159 wood was nearly half burnt and the wood 46 00:01:44,450 --> 00:01:43,020 from the tree only had a bit of 47 00:01:47,929 --> 00:01:44,460 blackening around the edges was 48 00:01:50,060 --> 00:01:47,939 essentially undamaged and remember these 49 00:01:52,550 --> 00:01:50,070 were subject to essentially exactly the 50 00:01:54,319 --> 00:01:52,560 same fire since the pieces were a bit 51 00:01:56,090 --> 00:01:54,329 large I did another experiment that was 52 00:01:58,219 --> 00:01:56,100 more to scale with my small fire 53 00:02:00,920 --> 00:01:58,229 I used a live twig and a small piece of 54 00:02:02,840 --> 00:02:00,930 dry attic scrap since the wood was small 55 00:02:05,420 --> 00:02:02,850 then any burning will be more sustained 56 00:02:07,580 --> 00:02:05,430 and complete and what happened again was 57 00:02:09,080 --> 00:02:07,590 the live wood just got a bit city but 58 00:02:11,660 --> 00:02:09,090 this time the dry wood burned up 59 00:02:13,940 --> 00:02:11,670 completely in fact the live wood was 60 00:02:15,830 --> 00:02:13,950 just as strong as it was before