Why Does Popcorn Pop?

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In this video:

First a little background, Popcorn or “zea mays everta” is a special kind of Flint corn, also known as “Indian corn” and sometimes “Calico corn”. Flint corn is readily recognizable as the kernels have a hard outer shell, likened to flint, hence the name. This hard outer shell is essential in making popcorn kernels pop. In fact, popcorn is the only type of corn that will pop.

Want the text version?: http://www.todayifoundout.com/index.php/2010/07/why-popcorn-pops/

Sources:

http://recipes.howstuffworks.com/20-things-you-didnt-know-about-popcorn1.htm
http://www.livescience.com/mysteries/060920_popcorn_pop.html
http://www.livescience.com/strangenews/050414_popcorn.html
http://recipes.howstuffworks.com/question255.htm
http://www.nasa.gov/audience/forkids/home/popcorn.html
http://www.illinois.gov/PressReleases/ShowPressRelease.cfm?SubjectID=3&RecNum=2214
http://en.wikipedia.org/wiki/Flint_corn
http://en.wikipedia.org/wiki/Popcorn
http://en.wikipedia.org/wiki/Cretors