Useful historical recap
Quick, what's the most influential piece of hardware from the early days of computing? The IBM 360 mainframe? The DEC PDP-1 minicomputer? Maybe earlier computers such as Binac, ENIAC or Univac? Or, going way back to the 1800s, is it the Babbage Difference Engine?
More likely, it was a 183-pound aluminum sphere called Sputnik, Russian for "traveling companion." Fifty years ago, on Oct. 4, 1957, radio-transmitted beeps from the first man-made object to orbit the Earth stunned and frightened the U.S., and the country's reaction to the "October surprise" changed computing forever.
For more on ARPA and J.C.R. Licklider's role, see the excellent book "The Dream Machine"