Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
One human hair can support 3 ounces.
191
The average person's skin weighs twice as much as their brain.
131
The human brain has the capacity to store everything that you experience.
4k
Your thumb is about the same size as your nose.
124
The average sperm cell swims at 8 inches per hour.
76
Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92