ELIC: Why can't humans regrow lost limbs?
hair and nails regrow, broken bones get fixed, injuries heal, so why not lost fingers at least? ELI5
Posted Apr 29, 2012, 11:00 PM UTC
74
Because losing limbs builds character.
3
Human's can't regrow limbs because they bullied the starfish in middle-school and now they won't share their evil secret.
3
Back during the great war in the year 0 all the animals and plants fought over unique abilities. We chose to fight over larger brains and occasional superpowers. Which is how humans rule the world, Santa delivers presents, and Spiderman protects New York. Also the reason fingers and limbs don't regrow is because we had a choice between regrowing limbs or having awesome people like Santa and Spiderman existing...you're welcome.
1
It's not about not being able to regrow, it's about the time it takes to regrow.
Look at how slow fingernails grow. Limbs are much larger, thus take longer to grow. It's estimated that just a single finger takes 75 years to grow back.