A number of theories have been proposed regarding the ultimate fate of the universe. Some, like the Big Crunch and the Big Rip, suggest the universe will come to an end, while others conclude that it will exist for an infinite period of time. Most cosmologists agree that the universe's average density, the rate at which it expands, and the physical properties of the mass and energy in the universe will determine its ultimate fate. What is the difference between an open universe and a closed one?
John Quincy Adams
Back in the day
Nicholas II was the last Czar of Russia, King of Poland, and Grand Duke of Finland. Ruling until his forced abdication in 1917, he proved unequal to the combined tasks of managing a country in political turmoil and commanding its army in World War I. Bolsheviks executed Nicholas and his family, fearing he would be liberated through a counterrevolutionary advance during the Russian Revolution. What famous mystic was involved in his court's affairs?
Born on a day like today
Rising to prominence with the birth of modern jazz in the mid-1940s, when he was a sideman in Charlie Parker's bebop quintet, Davis became a dominant force in jazz trumpet. He was influential in the development of cool jazz, led many small groups through the 1950s and 60s, and produced a successful blend of jazz and rock music in the 1970s and 80s. His trumpet and flÃ¼gelhorn styles were warmly lyrical and marked by a brilliant use of mutes. How old was Davis when he began to study music?