The Washington Post carried this story about an innovative line of research into the origins of clothing this morning. By comparing the DNA of human head lice, which lay their eggs only on hair, with human body lice, which lay their eggs only in clothing, these scientists claim to have been able to triangulate just when, exactly, we started covering ourselves up. Turns out, if this line of research is accurate, to have only ocurred about 75,000-150,000 years ago.