From Good Morning America.

President Donald Trump on Monday used the platform of the presidency to promote unproven and, in some cases, discredited ties between Tylenol, vaccines and autism as his administration announced a wide-ranging effort to study the causes of the complex brain. Elizabeth Schulze has the details; Perry Russom reports on one corner of TikTok claiming that the end is near, and the surprising origin of this theory; Danny New profiles a group of dads who are using their babies to stay fit and to become better parents; and more on ABC’s GMA First Look.

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