By National Geographic! Brookings reports the society's Genographic Project will send you a free kit to sample DNA from your cheeks. Send it in and they will get online results in a few weeks. Go to http://www.genographic.com/ to see the rules. The problem is it's not free! It's going to cost you @199.95. At least it's from a reputable source.
Read more @ Trace Your Genetic Ancestry Through National Geographic?s Genographic Project | Brookings Institution
Read more @ Trace Your Genetic Ancestry Through National Geographic?s Genographic Project | Brookings Institution