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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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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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.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.