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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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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.

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