The Holidays are supposed to be full of joy, but sometimes it isn't. Check out some of the worst things to ever happen on Christmas at HowStuffWorks.
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- Lambert, Katie. "How Atavisms Work." HowStuffWorks. http://science.howstuffworks.com/atavism.htm
- Wilson, Tracy V. "How Bioluminescence Works." HowStuffWorks. http://science.howstuffworks.com/bioluminescence.htm
- "Evolutionary 'fast-track,' in which the hunted outwit their hunters, could explain why human diseases progress so rapidly, Cornell biologists report." July 16, 2003. Cornell News. http://www.news.cornell.edu/releases/July03/rapid.evolution.hrs.html