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At last, real-life physics can justify all those fake movie explosions

Ever noticed that, in movies, the slightest tap of a bullet on a car or a helicopter will cause it to burst into flames, without the presence of an accelerant or any source of fuel? Finally there's a physical effect that can explain why a metal bullet slamming into a metal car can cause it to turn into a fireball.… » 3/01/13 6:30pm 3/01/13 6:30pm