The Penn colleagues and other community members meet three days a week for a roughly 30-minute jog and an occasional lecture. That’s right—during some runs, one of them delivers a talk; topics range from the brain to Bitcoin. Not your normal exercise chatter. But on this day last January, it would not be their normal run.
The first clue that something was off was the man who sprinted past them. “Probably running a 7:15 pace,” Cassidy told Runner’s World admiringly.
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