So You Took a DNA Test

You spit in a tube. Three to six weeks later you opened the app and stared at a pie chart of ethnicity percentages, a list of thousands of names you have never heard of, and a matching system promising to tell you who you are related to. You scrolled for an hour, felt a strange mix of excitement and confusion, and set the phone down thinking: now what. So You Took a DNA Test is the beginner's fiel...