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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 first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.

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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

The Configuration, Normal Pressures, and Oxygen Content of the Heart Chambers The Configuration, Normal Pressures, and Oxygen Content of the Heart Chambers
p53 (normal cell vs tumor cell) p53 (normal cell vs tumor cell)
Density of Papillae, and Hence Taste Buds, in a Supertaster and in a Normal Taster Density of Papillae, and Hence Taste Buds, in a Supertaster and in a Normal Taster
(A) Normal glomerulus and (B) acute glomerulonephritis. (A) Normal glomerulus and (B) acute glomerulonephritis.
Normal DNA vs Italian DNA Normal DNA vs Italian DNA
The distribution of the number of hours that a random sample of people spend doing chores per ... The distribution of the number of hours that a random sample of people spend doing chores per ...
Video: ADH and the arterioles, kidneys, sweat glands and the Atrial natriuretic peptide (ANP)

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