The Toba catastrophe theory suggests a volcanic winter 74,000 years ago nearly wiped out the human lineage.
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The Eiffel Tower was once the tallest man-made structure on Earth.
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The Trail of Tears forced Native American tribes westward in the 1830s.
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Your brain uses patterns to recognize faces almost instantly.
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The Earth is slightly flattened at the poles.
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The human brain contains about 86 billion neurons.
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The first successful heart transplant was performed in 1967.
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