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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.