In this April 30, 1968 file photo, police rush toward student protesters in the early morning outside Columbia University's Low Memorial Library as they sought to remove the demonstrators involved in sit-ions at university buildings in New York. Fifty years ago more than 700 protesters were arrested and more than 130 were injured when police retook student occupied buildings, during what was part of a year of global turmoil. (Photo by Dave Pickoff/AP Photo)





Color television requires 300 per cent more light than black and white and WNBQ, NBC-TV, first in the nation to become all-color beginning April 15, has been fitted with new facilities to handle it. Jules Herbuveaux, Chicago NBC vice president and general manager, explains new theatrical lighting panel to TV star Kay Westfall, April 5, 1956. (Photo by Edward Kitch/AP Photo)





Smoke billows from upper floor of Our Lady of the Angels parochial school on December 2, 1958 in Chicago where about 90 pupils and teachers perished yesterday in a flash fire. Schoolboy is brought down ladder at the Roman Catholic grade school on city's northwest side. (Photo by AP Photo)





Gunfire was brought to the steps of President Truman's Washington home, Blair House, as two assassins tried to kill the chief executive, November 1, 1950. One of the gunmen, Oscar Collazzo of New York, lay wounded at the bottom of Blair House's front steps after the president's police guard had finished their work, at the cost of one guards' life, Dec. 9, 1950. The second gunman was killed. (Photo by Harvey Georges/AP Photo)





Leg art for safety's sake. “Cats eyes” for pedestrians to make them visible in the headlights of automobiles and motorcycles were shown by an inventor at the German Inventors' Fair in Recklinghausen, Germany, December 21, 1956. Although “cats' eyes” for pedestrians are not brand new, may be this arrangement opens ways for more decorative designs. (Photo by Horst Faas/AP Photo)





Theater marquees and illuminated outdoor display signs were turned off in Times Square in abeyance with Mayor William O'Dwyer's order of a wartime dimout in New York, February 7, 1946. O'Dwyer ordered the dimout to conserve the fuel supply had become very low due to a tugboat strike. (Photo by Matty Zimmerman/AP Photo)





Gen. William C. Westmoreland, commander of U.S. Forces in South Vietnam, stands beneath a three combat-ready Hawk antiaircraft missiles at Da Nang, Vietnam, February 21, 1965. The General is inspecting two batteries of U.S. Marine Corps Hawks. (Photo by AP Photo)





This nighttime view looking south from Lake Street shows an illuminated State Street in the downtown district of Chicago's Loop, which is not affected by the wartime dimout, on January 6, 1943. (Photo by AP Photo)





Yankee center fielder Mickey Mantle is the center of attraction before undergoing a tonsilectomy at Lenox Hill Hospital in New York on January 17, 1956. The nurses, from left to right, are: Eleanor Hoffman, Catherine Craig, Maureen Kade, Kim Crocker, Ann Koch, and Anita Edwards. (Photo by AP Photo)





Olympic hostesses were put to the probing glances of Austrian Army soldiers during a rehearsal of the opening ceremony of the 12th Olympic Winter Games on Monday, January 26, 1976 in Innsbruck, Austria. (Photo by AP Photo/Endlicher)





Actor Kirk Douglas invited the studio workers of the Munich Geiselgasteig Studios to a barrel of beer to celebrate the commencement of the shooting of the film “Paths of Glory” March 20, 1957. (Photo by AP Photo/Sandensr)





White House press secretary James Brady lies wounded on the sidewalk outside a Washington hotel after being shot during an assassination attempt on U.S. President Ronald Reagan, Monday, March 30, 1981. In the background secret service agents and police wrestle the alleged assailant to the ground. (Photo by Ron Edmonds/AP Photo)





Lord Denman (1874 - 1954) and Lady Denman (1884 - 1954) take shelter with Lord Mayo during the Punchestown Races, County Kildare, 13th April 1910. (Photo by W. G. Phillips/Phillips/Getty Images)





A procession of elephants appearing in local theatre make their way along the street at Elephant and Castle, south London, 17th April 1936. (Photo by Reg Speller/Fox Photos/Getty Images)





Mothers with their children in front of their tenement homes, in Limehouse, London, on May 17, 1928. (Photo by AP Photo)





Their day's work done, miners who reported for duty at the Harlan Central Coal Company workings near Harlan, Ky., are shown leaving the mine under the guard of troops who escorted them through the picket line on May 16, 1939. (Photo by Preston Stroup/AP Photo)





Demonstrators smash glass out of the front doors of the San Francisco City Hall, May 22, 1979. About 5,000 persons marched from the city's gay community to City Hall, protesting the voluntary manslaughter conviction of Dan White in the fatal shootings of the mayor and a supervisor. (Photo by Paul Sakuma/AP Photo)





British rock star Elton John returns a ball during a ping pong match with a 13-year-old Li Dequn, June 1, 1983 in Peking, China. The towering rock star was beaten 0-2. Elton John is visiting China with the Watford football team. (Photo by Liu Heung Shing/AP Photo)





An Afghan rebel, armed with a light machine gun, rests after firing practice at the Khanday Khula rebel camp in Pakistan, near the Afghan border, June 30, 1980. (Photo by AP Photo)





Professor Auguste Piccard, who startled the world with his flight into the stratosphere, in Brussels, May 26, 1932 with the new gondola which he has constructed for a similar flight from the same spot near Augsburg, Germany, in June, 1932. Professor Piccard will not make this new Flight because of promises he had made to his wife, although, his protégés will be in the gondola. (Photo by AP Photo)