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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.
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Everyone has one nostril that is larger than the other.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
![Testing Visual Fields by Confrontation: The nurse and patient should be approximately at an eye to e](https://biology-forums.com/gallery/47/medium_2137_23_05_12_12_19_58.jpeg)
![Epidemiologists look for the causes of disease, such as toxic waste and industrial pollution, at the](https://biology-forums.com/gallery/47/medium_273688_23_02_15_7_45_12_20863285.jpeg)