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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

hepatitis virus hepatitis virus
The effects of alcoholism on the body systems. The effects of alcoholism on the body systems.
Geographic distribution of hepatitis A prevalence (anti-HAV-antibody), 2005. Geographic distribution of hepatitis A prevalence (anti-HAV-antibody), 2005.
Hepatitis B antigens and antibody in an acutely infected patient with recovery. Note the indicators ... Hepatitis B antigens and antibody in an acutely infected patient with recovery. Note the indicators ...
Hepatitis C virion structure. Hepatitis C virion structure.
Viruses, such as the hepatitis B virus shown here, need a host to survive and multiply Viruses, such as the hepatitis B virus shown here, need a host to survive and multiply
Video: Types of disease resistance: innate defenses & immunity

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