Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Your thumb is about the same size as your nose.
124
One human hair can support 3 ounces.
191
The human body contains over a billion miles of DNA.
147
The average person's skin weighs twice as much as their brain.
131
Chewing gum boosts your brain power.
285
The human brain has the capacity to store everything that you experience.
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