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Happy DNA Day everyone. On this date in 1953, Nature published four articles on the structure of DNA, including the 800-word, data-free masterpiece by Watson and Crick—but also the work of Rosalind Franklin, Raymond Gosling, and Maurice Wilkins that did actually have data, and without which the first Watson and Crick paper would have been handwaving fluff. The Watson-Crick paper is a rightful classic of the scientific literature, but it’s too easy to forget those who provided the evidence to back them up.

To celebrate, the genetic testing company 23andMe posted a DNA Day infographic that is a marvelous inadvertent evidence of genetic oversell. That’s the best kind, because it unself-consciously undermines its own claims.

These claims are about health. Last year, the company was ordered to stop marketing their genomic testing service as a health service and it agreed to stop selling it altogether. It would henceforth focus on the genealogy side of their service. They are evidently sneaking back in, though, with ads—sorry, “infographics”; so much more documentary-like than “advertisements”— like this one.

Ninety-one percent of Americans, it...