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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
The familiar sounds of your heart are made by the heart's valves as they open and close.
The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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.