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List of unsolved problems

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This is a list of articles about unsolved problems in various subjects:

Unsolved problems in mathematics
Unsolved problems in physics
Unsolved problems in chemistry[?]
Unsolved problems in biology
Unsolved problems in economics[?]

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Quackery

... medicine, often by lying. Cost. Pharmaceutical companies and doctors charge a lot of money for their services. Quacks can easily undercut them, by providing wha ...