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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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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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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.

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