The surprisingly scientific flash behind the fireworks

In honor of Independence Day, MSNBC.com offers some insight into how pyrotechnicians use physics and chemistry with flair:

As you ooh and aah at the dazzling explosions of a fireworks display, there are three things going on that you probably wouldn’t guess: The chemists who made those pyrotechnics designed most of them so they wouldn’t explode, you’re actually seeing nature conserving energy, and most peculiar of all, when things are at their flashiest, you’re actually seeing the fireworks as they’re cooling down.

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