Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
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The average temperature at 40,000 feet above sea level is -60 F.
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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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The bark of an older redwood tree is fireproof.
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Every day, plants convert sunlight into energy equivalent to six times the entire power consumption of human civilization.
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