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Did you know?

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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

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

African lions are highly social predators. African lions are highly social predators.
Formation of an oil deposit Formation of an oil deposit
Malignant melanoma. This photograph demonstrates the highly characteristic color of this tumor. Malignant melanoma. This photograph demonstrates the highly characteristic color of this tumor.
The S-curve in the human vertebral column--a result of the evolution of bipedality--makes humans hig The S-curve in the human vertebral column--a result of the evolution of bipedality--makes humans hig
Rates of Childhood Overweight and Obesity Worldwide The highest rates occur in the most affluent re Rates of Childhood Overweight and Obesity Worldwide The highest rates occur in the most affluent re
What are the highest virtues? What are the highest virtues?
Video: Rh blood type and complications during pregnancy & Fertilization

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