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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
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.