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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.
More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
Vaccines prevent between 2.5 and 4 million deaths every year.