In the Oct 23 issue of Nature, the cover picture shows the X-ray image of a human finger taken with peeling tape as the X-ray source. Researchers at UCLA reported that peeling sticky tape (i.e. Scotch tape) in a vacuum generated X-rays.
http://www.nature.com/nature/journal/v455/n7216/abs/nature07378.html
The amazing streaming video is here.
http://www.nature.com/nature/videoarchive/x-rays
The sticky tape emits X rays only in a vacuum. But you can get a flash of light (namely, triboluminescence) when you peeled it in a dark room.
This report is very interesting. The research needs to be nominated for an Ig Nobel Prize!
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