More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.
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The human body produces and destroys 15 million blood cells every second.
Emperor penguins with their black and white plumage stand out against the snow and colonies