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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.

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More than 4.4billion prescriptions were dispensed within the United States in 2016.

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