Your thumb is about the same size as your nose.
124
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
The brain receives 20% of the body’s oxygen and 25% of total body glucose utilization, despite it accounting for only 2% of a person’s weight (about 1.4 kilograms).
8
There's 100 trillion good bacteria living in your body.
17
Held in farts enter your bloodstream and are bad for your body.
26
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
22
For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
515