My Christmas present to myself this year involved gathering saliva. First I had to collect it in a very little vial. It turns out that this isn’t a small thing. After sitting there for about a half an hour, imagining grapefruits and lemons, I had enough to send it to 23 & Me, an organization devoted to opening the secrets of your personal genetic code. I just received the results today. I open the virtual envelope. Drum roll, please….and…