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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Green tea is able to stop the scent of garlic or onion from causing bad breath.
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.
People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.