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There are approximately 3 million unintended pregnancies in the United States each year.
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Illicit drug use costs the United States approximately $181 billion every year.
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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.