Related HowStuffWorks Articles
Sources
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- Ansel Adams Gallery. "Visit Us in Yosemite National Park." 2008. (Accessed 5/18/09) http://www.anseladams.com/content/yosemite/yosemite-national-park.html
- Kibe, Naomi. "Everglades National Park." NPS IVIP. 2008. (Accessed (5/18/09) http://www.nps.gov/oia/topics/ivip/ivip.htm
- McConnell, Harvey. "Brain Serotonin Production Directly Related to Degree of Sunlight." Lancet. December 5, 2002. (Accessed 5/18/09) http://www.docguide.com/news/content.nsf/news/8525697700573E1885256C86003D5B1F
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