Pick into the depths of your belly button, in or not in front of a mirror. Preferably use your nail. What do you find? I found some chunks of solidified lint and dog hair and dusty stuff. Edit: Don't forget to go DEEP into the core, as much as possible
I went as far back as possible. Still nothing. I clean that shit out when I shower, and I've been shirtless all day...so no lint
You have no idea... "From 60 belly buttons, the team found 2,368 bacterial species, 1,458 of which may be new to science."