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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.