This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
Map of the World's Religions
Ottoman Empire and the Arab World, 1914
Upward social mobility, though welcome, can place people in a world so different from their world of ...
World Population Growth
Per capita consumption of power is high in the developed world and highest in the United States
Penicillin saved the lives of many soldiers in World War II