Why does a mouse age in years while we age in decades?

A mouse born on your birthday is gone within two years, a chimpanzee might reach its forties, but humans routinely double that. This video traces the biological and social bargains — from slow-aging bodies to caregiving elders — that pushed our species' clock so far past every other mammal's. Along the way, an ancient healed bone hints at a surprising force behind our extra decades: each other.Educational content — sources for every claim are cited in the video.