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Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
![Part of the Hubble Ultra-Deep Field image showing a typical section of space containing galaxies int](https://biology-forums.com/gallery/47/medium_12359_17_05_12_12_46_12.jpeg)
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