Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Illicit drug use costs the United States approximately $181 billion every year.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
Cooked tarantula spiders are considered a delicacy in Cambodia.
Everyday situations sometimes present opportunities for children to build information processing ...
Testing the patellar reflex with a percussion hammer.