Research solves centuries-old riddle of Prince Rupert's drops
Small glass structures resembling tadpoles that can withstand the blows of a hammer and yet burst into powdery dust by simply snipping their threadlike tails have been a source of fascination and mystery since they were discovered in the 17th century.
Related Link: http://www.purdue.edu/newsroom/releases/2017/Q2/research-solves-centuries-old-riddle-of-prince-ruperts-drops.html