23andMe asks, "How much do you really know about your genes?" Have you met the intense ACTN3 gene that impacts your muscle composition? Or the twitchy BTBD9 gene that makes it hard to fall asleep at night? You might even have genes the cause celiac disease, link you to Neanderthals, make you lactose intolerant or explain your caffeine addiction. 23andMe says you can meet these genes and over 25 more with its genetic report.