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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

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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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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.

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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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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.

Negative control of a repressible set of genes: function of the trp repressor and corepressor in reg Negative control of a repressible set of genes: function of the trp repressor and corepressor in reg
A Withdrawal Reflex A Withdrawal Reflex
Positive and Negative Symptoms of Schizophrenia Positive and Negative Symptoms of Schizophrenia
Learning without Reinforcement (2 of 2) Learning without Reinforcement (2 of 2)
Negative feedback control of the female reproductive hormones. Negative feedback control of the female reproductive hormones.
Suppressing Negative Emotions Suppressing Negative Emotions
Video: Acid-base imbalances - compensation of metabolic acidosis and alkalosis

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