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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

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

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

Human Body by Children Human Body by Children
Types of Laboratory Tests Types of Laboratory Tests
Procedures for Diagnostic Tests Related to the Digestive System Procedures for Diagnostic Tests Related to the Digestive System
Pregnant and Lactating Women, Children, the Ill, and Older Adults Are at the Highest Risk Pregnant and Lactating Women, Children, the Ill, and Older Adults Are at the Highest Risk
Gender and Play in Children (2 of 2) Gender and Play in Children (2 of 2)
Children were given the same set of concrete operations tasks five times Children were given the same set of concrete operations tasks five times
Video: Exercise and cardiac output

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