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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.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
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.
The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.