Evidence suggests that computers have already offloaded some of our cognitive skills in areas like short-term memory. In 1955, a Harvard professor named George Millar tested the memory limits of humans by giving his subjects a random list of colors, tastes, and numbers. When he asked them to repeat as many things on the list as they could, he noticed that they were all getting stuck somewhere in the neighborhood of seven. His paper, “The Magical Number Seven, Plus or Minus Two,” went on to influence how engineers designed software and how telephone companies broke down phone numbers into
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