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Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

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Everyone has one nostril that is larger than the other.

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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.

Species-rich Sonoran Desert landscape. Species-rich Sonoran Desert landscape.
The Eastern Banjo Frog is a common frog species across eastern Australia. The Eastern Banjo Frog is a common frog species across eastern Australia.
bone marrow human bone marrow human
Time Line of Human History From Upper Paleolithic Period to the Present Time Line of Human History From Upper Paleolithic Period to the Present
Mosaic X Chromosome Expression in Human Females Mosaic X Chromosome Expression in Human Females
Sensory receptors in human skin. Sensory receptors in human skin.
Video: Fetal Development of the Cardiovascular System

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