Decompression sickness is a disorder that often affects scuba divers who ascend from the depths too quickly, causing severe joint and muscle pain, nausea, paralysis, and even death—for no externally obvious reason. Under pressure, respiratory gasses are compressed and dissolved in the body's tissues. When a person rapidly moves to a lower pressure environment, the dissolved gases expand and form bubbles that cause "the bends." Workers in what other occupations are susceptible to this sickness?
Back in the day
The Dow Jones Industrial Average, often referred to as the Dow, is the best-known and most widely followed market indicator in the world. Tracking the performance of 30 blue-chip US stocks—which sometimes change—the Dow is thought to reflect the overall condition of the US economy. In 1932, the Dow reached its lowest point of the Great Depression, closing at 41.22—down almost 90 percent since 1929. It did not return to pre-1929 levels until 1954. When did the Dow reach its all-time high?
Born on a day like today
After two years of high school, Rockefeller—the man destined to become, by some estimates, the richest person in history—got a job as a bookkeeper. A few years later, he formed a food handling firm that prospered in the American Civil War. In 1863, he entered the brand new oil business, and within 15 years, his company dominated the American petroleum industry. A noted philanthropist, he donated $550 million during his lifetime. It has been said that Rockefeller had what two ambitions in life?