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Green tea is able to stop the scent of garlic or onion from causing bad breath.

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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.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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