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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).

