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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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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

Developmental steps in the formation of a plant embryo Developmental steps in the formation of a plant embryo
4 weeks old embryo 4 weeks old embryo
Development of the Eyes and Ears: External View - 28 days Embryo Development of the Eyes and Ears: External View - 28 days Embryo
A Drosophila embryo and (b) the adult fly that develops from it A Drosophila embryo and (b) the adult fly that develops from it
Visualization of gap gene expression in a Drosophila embryo Visualization of gap gene expression in a Drosophila embryo
Embryo After 3 Mitotic Divisions Embryo After 3 Mitotic Divisions
Video: Embryonic development - Weeks 5 to 8

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