Humans are the only animals with chin.
You have two kidneys but only one is necessary to live.
The human nose can detect 1 trillion smell.
The heart beats more than 3 billion in their total lifespan.
The foot is one of the most ticklish part of the body.
Thumbs have their own pulse.
Skin is the body's largest organ and can comprise of 15% of the human's body weight.
Blood makes up about 8% of your total body weight.
Your fingernails don't actually grow after you're dead.
Belly buttons grow special hairs to catch lint.
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