One-third of all humans experience photic sneezing. Do you sneeze in bright sunlight? Tune in to learn why in this clip from Stuff You Should Know. http://www.howstuffworks.com/ http://www.facebook.com/StuffYouShouldKnow http://twitter.com/SYSKPodcast http://itunes.apple.com/us/podcast/stuff-you-should-know-video/ http://itunes.apple.com/us/podcast/stuff-you-should-know/
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