"In some cases, a Prince Rupert’s drop can explode with such force that it will actually emit a flash of light." This got me wondering... and Google turned up

"In some cases, a Prince Rupert’s drop can explode with such force that it will actually emit a flash of light." This got me wondering... and Google turned up a hit from an 1855 (!) edition of the Encyclopaedia Brittanica [1], and a fascinating Wikipedia article about triboluminescence [2]. What a cool world we live in! [1] http://books.google.com/books?id=92xBAAAAcAAJ&lpg=PA564&ots=cRE1I06mtw&dq=prince%20ruperts%20drop%20flash%20of%20light&pg=PA564#v=onepage&q=prince%20ruperts%20drop%20flash%20of%20light&f=false http://books.google.com/books?id=92xBAAAAcAAJ&lpg=PA564&... [2] http://en.wikipedia.org/wiki/Triboluminescence http://en.wikipedia.org/wiki/Triboluminescence