2.
Some people faint after they pee.
3.
Your ovaries/testes developed in the same place as your kidneys.
4.
You won't be able to move your ring finger when you put your hand on a flat surface like this.
6.
Your left kidney is higher up than your right kidney.
7.
You can maintain your blood sugar without eating for up to 2 or 3 days.
8.
Adults have fewer bones than a baby.
11.
There are about 7000000000000000000000000000 atoms in a human body.
12.
Every atom in your body is billions of years old.