At Jefferson Lab where I work we used to have a fall festival and a highlight was pumpkin launching in all manner of apparatus designed by brilliant physicists and engineers!
I've heard that if you freeze a pumpkin in liquid nitrogen for long enough and then drop it off a building, it will glow as it breaks. The phenomenon is called triboluminesence. As a chemist, I have access to both pumpkins and liquid nitrogen, but I have never tried it. It's the same principle as wintergreen lifesavers. I'm guessing it has to be pretty dark to appreciate it. http://en.wikipedia.org/wiki/Triboluminescence
LMHI've seen triboluminescence and have long believed that it is a manifestation of the piezo electrical phenomenon. I'll bet that is the hell what it is. http://en.wikipedia.org/wiki/PiezoelectricityThanks for the salubrious dose of science.
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