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Did you know?

Your heart beats over 36 million times a year.

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

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There are actually 60 minerals, 16 vitamins, 12 essential amino acids, and three essential fatty acids that your body needs every day.

Epidemiologists look for the causes of disease, such as toxic waste and industrial pollution, at the Epidemiologists look for the causes of disease, such as toxic waste and industrial pollution, at the
Jean Piaget influenced the field of developmental science more than any other individual. Jean Piaget influenced the field of developmental science more than any other individual.
Shy children often have a high arousal level in novel social situations. Over time, parents can help ... Shy children often have a high arousal level in novel social situations. Over time, parents can help ...
Numerical pain level chart with word modifiers. Numerical pain level chart with word modifiers.
Upper-Level Maps Upper-Level Maps
Changes in the Level of Education, 1975-2010 Changes in the Level of Education, 1975-2010
Video: Genetic distance between human groups

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