In 1809, two countries declared war and then forgot to sign a peace treaty for years.
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The human brain contains roughly 86 billion neurons.
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The human brain continues to develop into early adulthood.
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There are more possible shuffles of a deck of cards than seconds since Earth formed.
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Certain sea slugs can incorporate stinging cells from their prey.
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The Earth's outer core is liquid metal.
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A polar bear’s fur traps heat efficiently.
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The Ice Age ended about 11,700 years ago.
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The Earth's magnetic poles slowly shift over time.
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