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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

Female African elephant with calf, in Kenya. Female African elephant with calf, in Kenya.
A female mosquito Culiseta longiareolata A female mosquito Culiseta longiareolata
Canvasback - female with ducklings Canvasback - female with ducklings
(A) The male pelvis (android) is shaped like a funnel, forming a narrower outlet than the female. (B (A) The male pelvis (android) is shaped like a funnel, forming a narrower outlet than the female. (B
Female Reproductive System Female Reproductive System
The Female Reproductive System The Female Reproductive System
Video: Types of antimicrobial substances (interferons & complement protein)

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