Scientists have discovered how the toxoplasmosis parasite may trigger the development of schizophrenia and other bipolar disorders.

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A common parasite can increase a women's attractiveness to the opposite sex but also make men more stupid, an Australian researcher says.

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"On paper, Toxoplasma gondii looks as if it ought to be the most famous parasite on earth. This single-celled pathogen infects over half the world's population, including an estimated 50 million Americans.

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