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Did you know?
There are 60,000 miles of blood vessels in every adult human.
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The average office desk has 400 times more bacteria on it than a toilet.
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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
![Giardiasis. Colorized electron micrograph of a Giardia protozoan adhering to the surface of an epith](https://biology-forums.com/gallery/47/medium_14755_26_10_12_5_23_00_96851294.jpeg)
![Uranus revolves around the Sun once every 84 Earth years. Its average distance from the Sun is rough](https://biology-forums.com/gallery/47/medium_12359_13_01_13_4_44_12.gif)