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.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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You forget 90% of your dreams.
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Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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