<!--pageType= magazinesmallslug= st_3smartsection= medtechsubsection= healthheadline= 3 Smart Things About Sunburn-->&ltp>&ltstrong&gt1 Early hominids may have developed a sensitivity to UV rays for the good of the species. Based on a study using blood plasma, just an hour in direct sunlight could cause a 30 to 50 percent drop in folate levels &ampmdash; and low folate is linked to both abnormal sperm and birth defects. Good news for nerds: It's survival of the palest!&ltp>&ltstrong&gt2 World War II sailors were early adopters of sunscreen. The zinc oxide they smeared on their noses served to reflect and scatter UV light. Today's lotions have added organic compounds that absorb UV energy and dissipate it as heat.&ltp>&ltstrong&gt3 The sun isn't all evil. It stimulates your skin to produce vitamin D, and one study suggests that 1,000 IUs of D per day reduces your risk of certain cancers by up to 50 percent. But that's not a free pass to bake: More than 15 minutes of exposure daily over 40 percent of your body might just be an invitation to skin cancer.&ltbr style="clear: both;"/> &lta style='font-size: 10px; color: maroon;' href='http://www.pheedo.com/hostedMorselClick.phphfmm=v2:3cf4d4da20e0e0a3767a606bfe1c9f2d:Fqhx89sg6PB39GHdQ29kWf2jDvyJmUxgD65b3vXmQbY6weCY0HsCqHErQBgvRdX+qys8rqhSiQfqflsJYwotYJ83GrYT5QLlIsDivXvGXJo='>&ltimg border='0' title='Add to Facebook' alt='Add to Facebook' src='http://www.pheedo.com/images/mm/facebook.gif'/> &lta style='font-size: 10px; color: maroon;' href='http://www.pheedo.com/hostedMorselClick.phphfmm=v2:b5fcc715cea9efdff7a9b105e9fcd241:fdgSxzcjyy31G99ctuxzUJ7KaBC516GHR59dUjBxmYx52HtMEwyxTVm4n7PW4hyR9J3zwmrOq2w8mDpCxSXser6JZn6Ha1oslcftjnhjox0='>&ltimg border='0' title='Add to Reddit' alt='Add to Reddit' src='http://www.pheedo.com/images/mm/reddit.png'/> &lta style='font-size: 10px; color: maroon;' href='http://www.pheedo.com/hostedMorselClick.phphfmm=v2:e7015cbbde698f26ce6652cfb77cac04:+OMAe+C7t7Sy6zWL01+l0ReeQ0q+1SLYTN4Gk8te+d2IqSHGZ5v/p5CwkK/SH1V/dnkhVB4JYvjQiy2cYjHByTq0QC2NsQ5x0KwYmEHksVI='>&ltimg border='0' title='Add to digg' alt='Add to digg' src='http://www.pheedo.com/images/mm/digg.gif'/> &lta style='font-size: 10px; color: maroon;' href='http://www.pheedo.com/hostedMorselClick.phphfmm=v2:87db49343f08f5211ac9199c3026a962:d2gcB3AYAsHziGiLQX2aHaC8c6oSYUNzH3GrCuhcHE5xi6o3DuTxnchZriGogXVVpe24CAPZxA9Q7l+mkQGkxPFoJfGTtjDUkO2+SJgqkYU='>&ltimg border='0' title='Add to Google' alt='Add to Google' src='http://www.pheedo.com/images/mm/google.png'/>&ltbr style="clear: both;"/> &ltimg alt="" style="border: 0; height:1px; width:1px;" border="0" src="http://www.pheedo.com/img.phdoi=c7512c1bd44e6e5ee14c1a03da6a627d" height="1" />&ltimg src="http://www.pheedo.com/feeds/tracker.phpi=c7512c1bd44e6e5ee14c1a03da6a627d" style="display: none;" border="0" height="1" alt=""/>&ltp>&lta href="http://feeds.wired.com/~a/wired/indexa=gRDaxL">&ltimg src="http://feeds.wired.com/~a/wired/indexi=gRDaxL" border="0">&ltimg src="http://feeds.wired.com/~r/wired/index/~4/362599077" height="1" />