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Did you know?

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.

Did you know?

If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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Video: Role of complement proteins

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