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This is our wind
tunnel that we built

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to test the saltation
sensor, which is an instrument

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that we're going to fly on
a lander that goes to Mars.

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The saltation sensor
detects particles

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as they bounce off the surface.

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So this sensor will be very
close to the surface of Mars

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on the bottom of a lander.

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The wind on Mars would lift

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up the particles they
would hit the sensor

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and this would detect
the number of impacts,

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the energy of the
impacts and the direction.

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I remember one time someone
brought me a lawnmower

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that said it was broken.

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He said, "Aw you can have
it, it doesn't work anymore."

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I worked on it that
day, got it working.

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I felt kind of guilty
after...because I was cutting

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the grass with it, I should
have given it back to him.

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He said I could still
have it though.