The human body produces red blood cells in bone marrow.
Fact #202
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Your brain can recognize a familiar face in less than half a second.
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People can survive weeks without food under certain conditions.
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There are people alive today whose hearts have stopped for hours and were restarted.
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The human body produces red blood cells in bone marrow.
Fact #202 · Human Body
Your body produces about a liter of mucus every day — most of it you swallow.
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