Americans are obsessed with tracing their family trees. Enabled by the Internet and advances in genetic technology, millions of people are diving deep into their family histories on WikiTree and Ancestry.com, or discovering their ethnic make-up down to the decimal point using 23andMe. Someday, the explosion of DNA-based genealogy could even create a universal family tree. So, how could these data sets alter how we think about ourselves? Should you feel a connection with someone because a genetic test says she's your seventh cousin?
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New America