Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Diagram of a flagellate stramenopile cell, showing characteristic flagellar hairs.
human body
sperm cell
Some scholars regard Walt Whitman as a poet of nature, and others, a poet of the body—a reference to