The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Your body is creating and killing about 2.4 million red blood cells per second.
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The largest breed of rabbit is the Flemish Giant.
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A cow produces around 200,000 glasses of milk in her lifetime.
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An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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