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IIRC heart disease is the second most common cause of death, something in the region of 20%. So not all, but a substantial fraction of us have heart conditions.

Which might be why they thought that he had it. They seemed to be incorrect about something or he wouldn't routinely outperform his brother in physical sports.

Many athletes die young from heart conditions - a heart that's overperforming is one that's wearing itself out faster.

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