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Rows of students wearing blue school uniforms sit at desks and take notes.

In 2016, I got my genome sequenced while I was working on a book about heredity. Some scientists kindly pointed out some of the interesting features of my genetic landscape. And then they showed me how to navigate the data on my own. Ever since, I’ve been a genomic wayfarer. Whenever I come across some new insight into the links between our genes and our lives, I check my own DNA. One day I’m inspecting a mutation that raises my risk of skin cancer. The next I’m discovering I have a variant for smooth teeth.

I often consult a website called DNA.Land, run by a team of scientists affiliated with the New York Genome Center who use it to collect genetic data from volunteers for scientific research. Over 100,000 people have signed up so far (the service is free, and the researchers don’t sell the information to third parties). As a token of appreciation, the researchers write programs to analyze their volunteers’ DNA, generating new reports based on the latest studies.

On a recent visit to DNA.Land, I scanned...