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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.