The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
The University of Oxford (teaching since 1096) predates the Aztec empire (1428 - 1521).
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In the last 7 years, humanity has discovered 43 potentially habitable planets.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Only about 2% of the world population has green eyes.
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Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3