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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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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.

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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

This jumping spider's main ocelli (center pair) are very acute. This jumping spider's main ocelli (center pair) are very acute.
Electrical charge of the inner and outer regions of nerve cells Electrical charge of the inner and outer regions of nerve cells
Renzo Piano, Jean-Marie Tjibaou Cultural Center, Nouméa, New Caledonia. 1991–98. Renzo Piano, Jean-Marie Tjibaou Cultural Center, Nouméa, New Caledonia. 1991–98.
Techniques for applying local anesthesia: (a) topical; (b) nerve block; (c) infiltration; (d) ... Techniques for applying local anesthesia: (a) topical; (b) nerve block; (c) infiltration; (d) ...
Model of a purple bacterial reaction center complex Model of a purple bacterial reaction center complex
Testing motor function of cranial nerve VII - Close both eyes Testing motor function of cranial nerve VII - Close both eyes
Video: Global warming and its effect on climate change

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