On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
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There's a regenerative candle that creates a new candle as it melts.
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Leonardo Da Vinci made a robotic lion in 1515 that would walk, sway, open its mouth and move its tail - it even had a compartment that opened to present flowers.
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Nachos were actually invented by a guy named Nacho. Happy Nacho Day!
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Yu Youzhen, a Chinese millionaire, works as a street sweeper for the sanitation department to set an example for her children.
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