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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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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Illicit drug use costs the United States approximately $181 billion every year.
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There are more sensory neurons in the tongue than in any other part of the body.
