Most humans see the world through three types of color receptors—red, green, and blue. However, people with tetrachromacy have a fourth receptor, allowing them to see millions of additional color variations that others cannot perceive. This rare trait is far more common in women, with up to 12% estimated to have the potential for tetrachromatic vision.
Excess Hair Growth
Although werewolves belong in myths, the condition known as hypertrichosis—often nicknamed “werewolf syndrome”—is very real. It causes excessive hair growth all over the body. Only about 50 cases have ever been recorded, making it extremely rare. The exact cause isn’t well understood, but it often runs in families and can be present at birth.
The Absence of Tonsils
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