Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Sound travels about 4 times faster in water than in air.
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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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Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
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At 15 years old, Jack Andraka invented a method of diagnosing pancreatic cancer, thus helping to save the lives of millions of people around the world. It is 168 times faster, 26,000 times cheaper, 400 times more sensitive, and has a 99% success rate.
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The smell of freshly cut grass is actually a plant distress call.
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Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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