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Prince Rupert's drops are glass beads created by dripping melted glass into cold water, which causes it to solidify into a tadpole shaped droplet with a long, thin tail. These droplets are characterized internally by very high residual stresses, which gives them some radical properties. You can strike the fat end with a hammer and it won't break, but it will explosively disintegrate if the tail end is even slightly damaged like a fragile male ego. 

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