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Did you know?

As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

Electron microscopic image of dinoflagellates Electron microscopic image of dinoflagellates
Diagram of the food chain Diagram of the food chain
Chromosomes as captured via electron micrograph Chromosomes as captured via electron micrograph
Comparing a Food Chain and a Food Web Comparing a Food Chain and a Food Web
Secondary Active Transport Secondary Active Transport
Active Transport in Vesicles: Bulk Phase Endocytosis (Pinocytosis) Active Transport in Vesicles: Bulk Phase Endocytosis (Pinocytosis)
Video: Evolutionary tree of life Animation

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