1939 -World’s 1st practical helicopter, the VS-300 designed by Igor Sikorsky takes (tethered) flight in Stratford, Connecticut
1956 - IBM introduces the RAMAC 305, 1st commercial computer with a hard drive that uses magnetic disk storage, weighs over a ton
1868 -Golf's 1st recorded hole-in-one by Tom Morris at Prestwick's 8th hole, Scotland
home-made clock was assumed to be a bomb - Mark Zuckerberg and
US President Barack Obama send supportive tweets
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