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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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.
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.
The average adult has about 21 square feet of skin.
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.

