(1896) Discovery of X-rays reportedGerman physicist Wilhelm Röntgen’s discovery of a new form of radiation, later dubbed by Röntgen as ‘X’ for unknown, is published in an Austrian newspaper. One of his first experiments is a film of his wife Bertha’s hand with a ring on her finger, seen here.X-radiation (composed of X-rays) is a form of electromagnetic radiation. Most X-rays have a wavelength ranging from 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz and energies in the range 100 eV to 100 keV. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. wiki/X-ray(1933) Golden Gate Bridge building beginsConstruction officially starts on the iconic San Francisco Bay span when 3.25 million cubic feet of soil is excavated to make way for the bridge’s anchorages. The bridge will open to traffic four years later, in May 1937.The Golden Gate Bridge is a suspension bridge spanning the Golden Gate strait, the one-mile-wide, three-mile-long channel between San Francisco Bay and the Pacific Ocean. The structure links the American city of San Francisco, California – the northern tip of the San Francisco Peninsula – to Marin County, carrying both U.S. Route 101 and California State Route 1 across the strait. The bridge is one of the most internationally recognized symbols of San Francisco, California, and the United States. It has been declared one of the Wonders of the Modern World by the American Society of Civil Engineers.
Phone: (415) 921-5858 Opened: May 27, 1937 Length: 8,980 feet (2,737 m) Width: 89′ 11″ (27.40 m) Longest span: 4,200 feet (1,280 m) Clearance below: 220 feet (67.06 m)
wiki/Golden_Gate_Bridge(1968) Czechs defy Soviets and begin Prague SpringAlexander Dubček is elected in Czechoslovakia and begins reforms to Communist Party restrictions in place since the 1940s. Seven months later, Soviet tanks will arrive to halt the revolution.The Prague Spring was a period of political liberalization in Czechoslovakia during the era of its domination by the Soviet Union after World War II. It began on 5 January 1968, when reformist Alexander Dubček was elected First Secretary of the Communist Party of Czechoslovakia, and continued until 21 August when the Soviet Union and other members of the Warsaw Pact invaded the country to halt the reforms.
Start date: Jan 05, 1968 End date: Aug 21, 1968
wiki/Prague_Spring(1973) Bruce Springsteen releases first albumHeralded by critics but slow to sell, ‘Greetings From Asbury Park, N.J.’ is Springsteen’s debut album. Its folk-rock smolder is the first spark in a career that will catch fire two years later.Greetings from Asbury Park, N.J. is the debut album by Bruce Springsteen. Produced by Mike Appel and Jim Cretecos during July–September 1972 at the budget-priced 914 Sound Studios, it was released on January 5, 1973 by Columbia Records. Sales were poor in the first year, but the album gained some significant critical reviews.
Release year: 1973 Genre: Rock, Indie / Alternative Label: Columbia Artists: Bruce Springsteen · E Street Band