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The "can crush" experiment.
So, while I was searching youtube for a video to convince my sisters that you could crush a can using nothing but changing air pressure, I found this. It's the coke can experiment that everyone loves... but on a bigger scale 
Crushing an oil drum with air pressure.
http://youtu.be/JsoE4F2Pb20
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"A mind once stretched by a thought will never regain it's original dimensions."
Optimists think the glass is half full.
Pessimists think the glass is half empty.
Engineers realize it's twice as big as it needs to be.
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