Hacker News new | past | comments | ask | show | jobs | submit login

Can live up to 50 years. OK. What happens when they do not? Does the body not regenerate them? Various kinds of stress can cause them to not live that long. It is not as black and white.





Applications are open for YC Summer 2020

Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | Legal | Apply to YC | Contact

Search: