Fun fact 5/2/2017

Prince Rupert’s Drop is a glass object that’s created by dripping molten glass into very cold water, causing the outside of the drop to cool and harden almost instantly, while the inside remains molten and cools more slowly which creates stored energy encapsulated in a solidified glass casing. A scientific enigma – the end result is a teardrop-shaped piece of glass that’s pretty much unbreakable at its bulbous ‘drop’ end, but which shatters from the slightest pressure at the elongated tail end.

http://www.sciencealert.com/watch-what-happens-when-a-bullet-hits-an-unbreakable-prince-rupert-s-drop

 

 

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