Genetic testing kits for the ordinary consumer are becoming more and more popular. People love learning about their family histories and their ethnic and genetic makeup. But there’s a cautionary tale here, as well. A venture through the mysteries of your DNA can turn up lots of surprises, and some may not be welcome. Bob talks about the highs and lows, and the pros and cons of widespread genetic testing with guest Libby Copeland, an award-winning journalist and the author of “The Lost Family: How DNA Testing is Upending Who We Are.”