Original observation ... thanks to George, my favorite fifth grader.
Consider the answer you might receive asking a grade-school child the
question "What is 2 plus 2?" in each of the last five decades:
in 1956 "4, of course"
in 1966 "3, but it's the method that's important"
in 1976 "just a second while I get out my calculator"
in 1986 "just a second while I launch 'Calculator' on my Mac"
in 1996 "just a second while I check the addition home page"