In 1908, a massive aerial explosion near Siberia's Stony Tunguska River flattened 500,000 acres (2,000 sq km) of forestâ€”felling an estimated 80 million trees over 830 sq mi (2,150 sq km) and producing a shockwave that shattered windows hundreds of miles away. Known as the Tunguska event, the explosion is thought to have measured 5.0 on the Richter scale, with an estimated energy 1,000 times more powerful than the atomic bomb dropped on Hiroshima. What do most scientists believe caused the event?
Back in the day
CBS was one of the three major broadcasting networks to dominate radio and television in the US before the advent of cable TV in the 1990s. CBS began broadcasting in 1927, with station affiliates scattered throughout the US. Its first television broadcasts in 1939 were largely experimental, but as television came to the forefront of American entertainment, CBS began to dominate television as it once had radio. What entertainment conglomerate took over CBS in 2000 in a deal valued at $37 billion?
Born on a day like today
Armstrong is an American cyclist who has been hailed as one of the finest in the sport. He is best known for overcoming testicular cancer to win the Tour de France a record seven consecutive times. The recipient of numerous awards and honors, he has devoted a considerable amount of time to his charity, the Lance Armstrong Foundation, which provides support for people with cancer. How, according to one recent scientific article, has cancer treatment enhanced Armstrong's athletic performance?