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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

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Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.

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

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People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

Macro of a Butterfly face Macro of a Butterfly face
Noon-Day Rest in Marble Canyon, after an original sketch by Thomas Moran, from J. W. Powell, ... Noon-Day Rest in Marble Canyon, after an original sketch by Thomas Moran, from J. W. Powell, ...
Items that would be difficult to replace bearing legal significance are sent by certified mail. Items that would be difficult to replace bearing legal significance are sent by certified mail.
Replace the canister’s top (making sure it is tight) and connect its hose to the fuel rail ... Replace the canister’s top (making sure it is tight) and connect its hose to the fuel rail ...
Macro-, Meso-, Micro-Levels of Society Macro-, Meso-, Micro-Levels of Society
Sports drinks can replace electrolytes and fluids lost during exercise Sports drinks can replace electrolytes and fluids lost during exercise
Video: What is Cholesterols? Introduction to Lipoproteins

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