got from 23andMe in its emailed summary was extensive—a detailed road map to future health hazards. It covers genetic links to many major illnesses, and as we scrolled through we traced our prospects of succumbing to everything from Alzheimer’s to heart disease. We had leapt somewhat blithely into the new frontier of gene testing, but when you see your potential future laid out in black and white, it’s a sobering moment. We were mostly lucky; there were no life-altering surprises in our DNA. We also learned cool, if somewhat random, facts about ourselves. Katty has genes similar to those of
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