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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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The human body produces and destroys 15 million blood cells every second.

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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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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.

World human population growth through history illustrates an exponential growth pattern. World human population growth through history illustrates an exponential growth pattern.
Far Oceania was the last of the regions of the world to be colonized by humans. Far Oceania was the last of the regions of the world to be colonized by humans.
How Much Food Does the World Produce Per Person? How Much Food Does the World Produce Per Person?
As the world’s population continues to grow, demands on limited resources for food production As the world’s population continues to grow, demands on limited resources for food production
Fertility in the Developing World Fertility in the Developing World
GloFish, marketed as the world’s first GM pet, are a controversial product of genetic engineering GloFish, marketed as the world’s first GM pet, are a controversial product of genetic engineering
Video: Second Messengers in the Inositol-lipid Signaling Pathway

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