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The original was posted on /r/todayilearned by /u/Spykryo on 2025-04-04 17:26:35+00:00.

Original Title: TIL that veteran astronaut John Young’s heart rate when launching on top of the Saturn V was only 70 bpm, the normal resting heart rate; meanwhile, his rookie crewmate’s heart rate was 144 bpm, more than double. Young later said his heart “was too old for it to go any faster”.