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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
Blood is approximately twice as thick as water because of the cells and other components found in it.
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.
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.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.