Everyone has one, but you might not know much about it. Here biologist Sarah Leupen, who teaches human and comparative animal physiology, explains the ins and outs of belly buttons. 1. Why do I even ...

I was a weird kid – I used to be very jealous of people who were left-handed, and desperately wanted an outie belly button (I don’t know what was going on with me either). Like 90% of people, though, ...

Add Yahoo as a preferred source to see more of our stories on Google. An 'innie' belly button Jessie Shaw via Unsplash I was a weird kid – I used to be very jealous of people who were left-handed, and ...

(The Conversation) – Everyone has one, but you might not know much about it. Here biologist Sarah Leupen, who teaches human and comparative animal physiology, explains the ins and outs of belly ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. (The Conversation) – Everyone has one, but ...