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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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Thyroid conditions may make getting pregnant impossible.
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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.