Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
The chemicals indole and skatole, which help to account for the particular smell of human feces, are used as ingredients in perfume!
-3
Flu shots only work about 70% of the time.
18
You can reschedule your sleeping pattern by not eating 12-16 hours before you want to be awake. Upon eating after this time period, your internal clock will reset to a new day, with the time of your first meal being interpreted as "morning".
11
Men have larger hearts; women's hearts beat faster.
77
There is a disease called ichthyosis that turns the skin scaly like a fish.
90
Your spit has a painkiller 6 times stronger than morphine. It contains a substance called opiorphin that is stronger than morphine.
39
The human body contains over a billion miles of DNA.
147