On Monday, President Donald Trump stood beside the “Make America Healthy Again” team for a “historic” announcement on autism. Back in April, Health and Human Services Secretary Robert F. Kennedy Jr. had promised to reveal what was causing “the autism epidemic” by September.

At the start of this month, people close to the MAHA movement suggested that Kennedy’s upcoming autism announcement would link Tylenol use during pregnancy with the condition. Researchers worried it would veer into vaccines. Both Kennedy and Trump have spread misinformation about an association between vaccines and autism in the past, despite many rigorous studies refuting any link.

Ann Bauer at the University of Massachusetts-Lowell, an epidemiologist who co-wrote a recent analysis about Tylenol and autism, told me,

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