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Author Question: There is widespread support among scholars for the proposition that the stage of formal operations ... (Read 43 times) |
Vaccines prevent between 2.5 and 4 million deaths every year.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Thyroid conditions may make getting pregnant impossible.
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 neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.