Mice bred to run three times farther show no fertility or lifespan cost
Aug 13, 2026
Being an elite athlete—at least for a mouse—does not shorten lifespan or limit how many children one can have. This is the finding of a study 30 years in the making, and it runs counter to accepted evolutionary theory.
https://phys.org/news/2026-08-mouse-assumed-offs-athleticism-fertility.html
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