Running phenom Sam Ruthe set another middle distance record - and there's belief it could go deeper than good genetics.
The 16-year-old broke Sir John Walker's overall national mile mark set at Oslo in 1982 at an indoor meet in Boston.
Ruthe's grandfather, Trevor Wright, is also a skilled runner, but he says genetics only contribute to a small part of the teen's success.
"I put it down to dedication, talent and a good coach and a good manager...definitely dedicated."
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