The "Rupert's Drop" mystery, solved

I didn't know this, but apparently if you drop a blob of molten glass into water, what's formed is called "Rupert's Drop". It is nearly impossible to break directly (with a hammer or such) but if you actually just cut the tail or nick it, boom goes the whole thing. Quite interesting.


This video shows some examples in fantastic slow motion, and explains very didactically how it happens. Worth a watch.

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