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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.

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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

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The longest a person has survived after a heart transplant is 24 years.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

Cooked tarantula spiders are considered a delicacy in Cambodia. Cooked tarantula spiders are considered a delicacy in Cambodia.
Circulatory System Circulatory System
The Nervous System The Nervous System
Booker T. Washington in his office at Tuskegee Institute, 1900. Washington chose a policy of accommo Booker T. Washington in his office at Tuskegee Institute, 1900. Washington chose a policy of accommo
Cartoon of Uncle Sam teaching states in Puck Cartoon of Uncle Sam teaching states in Puck
A dual-trace scope pattern showing both the power and the waste spark from the same coil ... A dual-trace scope pattern showing both the power and the waste spark from the same coil ...
Video: Chemical Messengers Animation

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