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Musk insists that his demolition of humanitarian aid didn’t cost lives. So I propose he take a trip with me. (Nicholas Kristof, 7/1)

The federal criteria require at least five of 10 IgG bands before the result counts as positive, because the proteins are not all unique to Lyme. Some closely resemble proteins on ordinary, harmless bacteria, including ones that live in the mouth and gut, so a person who never encountered Lyme can still light up a band or two. The most common of them, a flagellin protein, turns up in nearly half of healthy people in one study, many with little or no chance of exposure. A report that reads "two bands present" can look, to a frightened patient, like partial proof. It is closer to background noise, and standard testing calls it negative for exactly that reason. (Jake Scott, MD, 7/1)

By a 6–3 margin, the justices upheld state laws that define men’s and women’s sports by biological sex instead of gender identity. In other words, states cannot be forced to allow genetically male athletes who identify as women to compete in female sports; legislators have a legitimate interest in preserving fair opportunities for female athletes. (Helen Lewis, 7/1)

Wheelchair users rely on the technology to live and work, and shouldn’t have to tolerate long waits for repairs. (7/1)

A new study found that physical and cognitive gains in later life are surprisingly common. (Leana S. Wen, 6/30)