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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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.
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.