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Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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There are more bacteria in your mouth than there are people in the world.

Surgical instruments prepared for a procedure. Surgical instruments prepared for a procedure.
A Subject Prepared for a Night’s Sleep in a Sleep Laboratory A Subject Prepared for a Night’s Sleep in a Sleep Laboratory
Biologically Prepared Fear Biologically Prepared Fear
In a project on job discrimination, Pager prepared identical résumés for the teams, but with one ... In a project on job discrimination, Pager prepared identical résumés for the teams, but with one ...
a solution is prepared in which a trace or small amount of Fe2+ is added to a much larger ... a solution is prepared in which a trace or small amount of Fe2+ is added to a much larger ...
Four common staining procedures used in chromosomal analysis. Most karyotypes are prepared using G-b Four common staining procedures used in chromosomal analysis. Most karyotypes are prepared using G-b
Video: Hershey Chase Experiments

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