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Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.

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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

Signal amplification Signal amplification
(A) The structure of a neuron, showing the dendrites, nerve cell body, and axon. (B) Photomicrograph (A) The structure of a neuron, showing the dendrites, nerve cell body, and axon. (B) Photomicrograph
Positioning diaphragm of stethoscope Positioning diaphragm of stethoscope
Signal Detection Theory Signal Detection Theory
Eye movements with muscle and nerve coordination Eye movements with muscle and nerve coordination
From Signal Reception to Response From Signal Reception to Response
Video: Arthroscopy

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