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Did you know?

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

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The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.

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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

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There are 60,000 miles of blood vessels in every adult human.

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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

The elliptical galaxy Centaurus A at visible, far-infrared and x-ray wavelengths. The elliptical galaxy Centaurus A at visible, far-infrared and x-ray wavelengths.
The tenuous atmosphere of Mars, visible on the horizon in this low-orbit photo The tenuous atmosphere of Mars, visible on the horizon in this low-orbit photo
A crack in an exhaust manifold is often not visible. A crack in the exhaust manifold upstream of the ... A crack in an exhaust manifold is often not visible. A crack in the exhaust manifold upstream of the ...
The illusory bands visible in this figure are often called Mach bands, although Mach used a ... The illusory bands visible in this figure are often called Mach bands, although Mach used a ...
The Visible Spectrum of Electromagnetic Energy The Visible Spectrum of Electromagnetic Energy
Video: Steps of glucose catabolism

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