Hippies are lovable, hairy, and the reason you can get soy milk at most coffee shops. While the world needs all the help it can get, hippies usually need a bath.  But now they finally have science on their side. A study, conducted at the University of Missouri, tested 16 hair samples, eight washed and eight unwashed, over a 24-hour period. Researchers found that the un-shampooed samples were able to absorb seven times as much ground level ozone as the cleaner strands. While ozone exposure is attributed to respiratory problems and a rise in deaths, unwashed hair usually leads to a decrease in sex appeal.  So, we’re torn between our lungs and our looks—guess it all depends on if you want your breathing to be just as shallow.  [New Scientist]