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Did you know?

HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

Chromosomes Chromosomes
Independent assortment of chromosomes at meiosis explains Mendel’s ratio Independent assortment of chromosomes at meiosis explains Mendel’s ratio
A colorized image of human chromosomes A colorized image of human chromosomes
Distribution of sex chromosomes from generation to generation. All children receive an X chromosome Distribution of sex chromosomes from generation to generation. All children receive an X chromosome
Demonstration of sister chromatid exchanges (SCEs) in mitotic chromosomes Demonstration of sister chromatid exchanges (SCEs) in mitotic chromosomes
Drosophila Polytene Chromosomes Drosophila Polytene Chromosomes
Video: Pneumonia Animation

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