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Asthma cases in Americans are about 75% higher today than they were in 1980.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
The human body produces and destroys 15 million blood cells every second.