281. What groovy item was invented by Englishman Edward Craven Walker in 1963?
282. Who is the English physicist responsible for the 'Big Bang Theory'?
283. The Manhattan Project was started by President Roosevelt in 1942 to ensure that the U.S. beat the Germans in developing a nuclear bomb. Whom did Roosevelt appoint as scientific head the Manhattan Project?
284. What Enrico Fermi invented?
285. This statesman, politican, scholar, inventor, and one of early presidents of USA invented the swivel chair, the spherical sundial, the moldboard plow, and the cipher wheel.
286. When was the first lawn mower invented?
287. What 'game' was first produced by the Southern Novelty Company in Baltimore, Maryland in 1892?
288. Who invented the Spinning Jenny?
289. What office item was invented by Bette Nesmith Graham in 1951?
290. When was Milk Tray first introduced?
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