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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
![(A) The levels of the spinal cord and spinal nerves. (B) Photograph of the spinal cord as it descend](https://biology-forums.com/gallery/47/medium_14755_27_08_12_4_56_12_82161984.jpeg)
![The postoperative client supports an incision with a folded pillow when taking a deep breath and cou](https://biology-forums.com/gallery/47/medium_18099_26_09_12_4_42_16.jpeg)