Scientists are now able to grow 'beating' heart tissue in a lab!
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It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
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Sound travels about 4 times faster in water than in air.
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Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
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A cubic yard of air weighs about 2 pounds at sea level.
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In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
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The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
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