› added 5 years ago

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TIL that blood turns green when 30 feet underwater, because red light cannot reach that far down so the green pigments in our blood are reflected back instead.

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kQK4 TIL the dental drill was invented 9000 years ago, predating the wheel by 3500 years.
6yRl TIL It is likely that male humans have thicker penises than other primates because women have a bigger vagina to fit our large developed heads out.
xemk TIL mirrors are placed near elevators as a psychological trick to make wait seem more tolerable. People like to look at themselves.
nvO7 TIL Arrichion, a wrestler in the ancient Olympics won a match by using a maneuver which caused his neck to break, killing him instantly. His opponent suffered from a dislocated foot, and submitted. Arrichion was named the winner.
mxdGR TIL The Hagia Sophia has some odd scratches inside. For hundreds of years, their origin and purpose was unknown. It was later discovered that they are Futhark runes made by a Norseman far from home. A message, carved into the building he knew would never be destroyed. The message? “Hafdan was here.”