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There are more nerve cells in one human brain than there are stars in the Milky Way.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.