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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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Medication errors are more common among seriously ill patients than with those with minor conditions.

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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Human embryonic stem cells forming rosettes, a sign of neural differentiation Human embryonic stem cells forming rosettes, a sign of neural differentiation
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The American Sign Language Alphabet. The American Sign Language Alphabet.
Matthew Ritchie, No Sign of the World. Matthew Ritchie, No Sign of the World.
A downward-sloping spark line usually indicates high secondary ignition system resistance or an ... A downward-sloping spark line usually indicates high secondary ignition system resistance or an ...
Waiting in line for a photocopier Waiting in line for a photocopier
Video: Requirements for nervous signals

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