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Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

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The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Did you know?

There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

Tropical deciduous forest in Bandhavgarh National Park, India Tropical deciduous forest in Bandhavgarh National Park, India
Tuktut Nogait National Park, Northwest Territories, Canada Tuktut Nogait National Park, Northwest Territories, Canada
Female nursing cub, Amboseli National Park, Kenya Female nursing cub, Amboseli National Park, Kenya
An ocelot at Woodland Park Zoo in Seattle, Washington. An ocelot at Woodland Park Zoo in Seattle, Washington.
Tiger quoll at a wildlife sanctuary area at Queens Park, Ipswich, Queenland, Australia Tiger quoll at a wildlife sanctuary area at Queens Park, Ipswich, Queenland, Australia
Video: A Human Karyotype Preparation Animation

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