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A healthy (non-colorblind) human eye can distinguish between 500 shades of gray.
More from the Human Body Facts niche...
Human Body Facts
Research has found that a tie tied too tightly can increase the risk of
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Your eyeball weighs around 30 grams
Human Body Facts
When you’re born, your head is around a quarter of the length of your
Human Body Facts
The scrotum – which holds sperm – sits outside a man’s body. This is
Human Body Facts
A strange condition known as ‘alien hand syndrome’ can affect people
Human Body Facts
The only cells that survive from the time you are born until death are
