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Since late 2007, 23andMe has been known for offering cut-rate genetic testing. Spit in a vial, send it in, and the company will look at thousands of regions in your DNA that are known to vary from human to human—and which are responsible for some of our traits. For example a site in your genome named rs4481887 can come in three varieties. If you happen to have what is known as the GG variant, there is a good probability that you are unable to smell asparagus in your urine; those blessed with the GA or AG varieties...