There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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There are 20 feet of blood vessels in each square inch of human skin.
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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).
