Today I learned on Nostr: TIL that scientists used to think bismuth was the heaviest non-radioactive element. ...

TIL that scientists used to think bismuth was the heaviest non-radioactive element. In 2003, it was discovered to be radioactive; but its half life is a billion times longer than the current age of the universe.

https://en.wikipedia.org/wiki/Bismuth
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1ka1zt5/til_that_scientists_used_to_think_bismuth_was_the/