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Did you know?

Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

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Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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Asthma cases in Americans are about 75% higher today than they were in 1980.

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Control of Extinction Control of Extinction
This painting depicts New Orleans in 1803, when the city was acquired—along with much of the modern This painting depicts New Orleans in 1803, when the city was acquired—along with much of the modern
Edward Bellamy, author of the utopian novel Looking Backward (1888) Bellamy’s socialism worried many Edward Bellamy, author of the utopian novel Looking Backward (1888) Bellamy’s socialism worried many
A section of the retina. The fovea is the indentation at the center of the retina; it is specialized ... A section of the retina. The fovea is the indentation at the center of the retina; it is specialized ...
Sagittal section of brain Sagittal section of brain
Video: Transmission Across a Synapse

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