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Octopuses have three hearts: two pump blood through the gills, one pumps oxygenated blood to the body. Learn why they have blue blood and why their heart stops when they swim.
The Great Wall of China cannot be seen from space with the naked eye. It is too narrow and blends into the landscape. Astronauts have confirmed they could not see it.
Tears don't fall down in space - they just stick to your eyes like a big, salty bubble because there is no gravity to pull them away.
Fredric Baur was so proud of the Pringles can he designed that he asked his family to bury part of him inside one!
Cher Ami was a brave messenger pigeon who flew through bullets and smoke to deliver a message that saved nearly 200 lost soldiers!
It sounds like a magic trick! A polar bear’s fur is transparent, and underneath all that "fuzz," their skin is as dark as coal.
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