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Did you know?
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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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Blood is approximately twice as thick as water because of the cells and other components found in it.