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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
There are 60,000 miles of blood vessels in every adult human.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.