Ideas please !

[macdhui]

Hello clever mumsneters! Can anyone think of something that has always been believed but has recently been proved false? Please help!

Bump !

Pluto being a planet?

I thought electricity pylons somehow collected electricity from the atmosphere. Yes I did and am not thick.

That infants can not feel pain.

en.m.wikipedia.org/wiki/Pain_in_babies

That the glass in old windows is thicker at the bottom because glass is a liquid.

That only humans and a few of the most intelligent mammals can recognise themselves in a mirror. Apparently cleaner wrasse may be able do it too.

www.biorxiv.org/content/early/2018/08/21/397067