Belly buttons are scar tissue from the umbilical cord. When the umbilical cord is cut, you're left will a small stump of skin and when that falls off you're left with a belly button.
Occasionally, belly button scars will fade to the point of being almost non-existent!
Science has found that belly buttons house up to 2300 different kinds of bacteria!
People with hairy tummies are more likely to get belly button lint (or fluff). This is because lint is primarily made up of hair, skin cells, and fibres - things which are linked directly to the amount of hair on a person's body.
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It's an actual thing. The Guinness Book of Records has Graham Barker down as having the largest collection of belly button lint in the world. Not something I'd put on my CV.
Greek Christian monks practised navel contemplation called hesychasm. They believed it gave them insight into divine glory.
The technical term of navel-gazing is omphaloskepsis.
Belly button fetishes are a thing. One guy even tried to change his own belly button to an "outie" because he was so attracted to "outie" belly buttons.
Earth's belly button - or "cosmic navel" is in Utah’s Grand Staircase-Escalante National Monument. It’s about 216,000 years old and approximately 200 feet wide. It even looks like an "innie" and an "outie"!
Biologist Christina Agapakis and artist Sissel Tolaas joined forces in order to make cheese from the bacteria found in people’s belly buttons. And armpits, toes, and mouths.
Now please excuse us while we go and vomit....