First Valentine: The oldest known Valentine's Day card dates back to 1415, sent by Charles, Duke of Orleans, to his wife while he was imprisoned in the Tower of London.

Your left kidney is higher up than your right kidney.

Children grow faster in spring time than any other time of the year.

Butterflies taste with their feet.

Apples have similar response to caffeine because vitamins from the apple are released slowly throughout the body, making you feel more awake.

Bulgarians are known to be the biggest yogurt eaters in the world.

The oldest known disease in the world is leprosy.

Our nose and ears are the only body parts that never stop growing.

The idea of the lens was invented by Leonardo da Vinci.

The average person produces enough saliva in their lifetime to fill two swimming pools.

Relative to size, the strongest muscle in the body is the tongue.

Every 98 minutes, a new word is created.

Like the moon, love also develops in phases. It starts with obsession (serotonin levels are high at this time) but then cements into a relationship or a more mature form of love (oxytocin levels are high at this time) .

Camels have three eyelids.

The prefrontal cortex, the part of the brain responsible for making rational decisions, does not fully mature until age 25.


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Water can boil and freeze at the same time under certain conditions.


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Laughter expends energy, so it promotes weight loss.


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Tiger shark embryos fight each other in their mother's womb. Only one is born, which eats all the others.


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Japanese macaques make snowballs and play in them.

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The octopus has three hearts and blue blood.


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Did You Know?

Rain of fish is an annual weather event in which hundreds of fish rain from the sky onto the Honduran city of Yoro.


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