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Chemistry is the science of matter and the changes it undergoes during chemical reactions. In this section, learn about everyday chemistry, from chlorine beach to helium, and even why chocolate turns gray.
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"Why does caffeine keep you awake?." 11 December 2000. HowStuffWorks.com. <http://science.howstuffworks.com/question531.htm> 18 May 2008.
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Please copy/paste the following text to properly cite this How Stuff Works article:
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