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The Goddard Space Flight Center ( GSFC) is a major NASA space research laboratory located approximately 6.5 miles (10.5 km) northeast of Washington, D.C. in Greenbelt, Maryland, United States. Established on May 1, 1959 as NASA's first space flight center, GSFC employs approximately 10,000 civil servants and contractors.

The LCt95 or LCt100 value is estimated to be 40–83 mg per cubic meter for exposure time of two minutes. Calculating effects for different exposure times and concentrations requires following specific toxic load models. In general, brief exposures to higher concentrations are more lethal than comparable long time exposures to low concentrations.

May 1, 1961 (Monday) Betting shops became legal in the United Kingdom, permitting UK residents to place bets, through a bookie, on horse races without going to the track.; A wave of hijackings of U.S. airline flights to Cuba began as Miami electrician Antuilio Ortiz, who had purchased a ticket listing himself on the manifest as "Cofresi Elpirata" (after the 19th century Caribbean pirate ...

The Billboard Hot 100 is the music industry standard record chart in the United States for songs, published weekly by Billboard magazine. Chart rankings are based on sales (physical and digital ), radio play, and online streaming in the United States. The weekly tracking period for sales was initially Monday to Sunday when Nielsen started ...