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Did you know?

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.

Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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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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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

Unique markings identify individual humpback whales. Unique markings identify individual humpback whales.
Vegetative Organs and Systems Vegetative Organs and Systems
Jellyfish organs Jellyfish organs
Tissue layers in the bronchi. Tissue layers in the bronchi.
A lesion called a plaque in the brain of an individual with Alzheimer disease. A ring of degeneratin A lesion called a plaque in the brain of an individual with Alzheimer disease. A ring of degeneratin
Abnormal tissue growth and cancer development Abnormal tissue growth and cancer development
Video: Evolutionary tree of life Animation

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