Walter Cronkite in the Kitchen of 2001 (1967)

[starroute]

7. "Mommy, what's a typewriter?"

I remember reading Heinlein's "Red Planet" to my son when he was little. I didn't have to explain any of the science fiction concepts to him, but I did have to explain what slide rules were and why wrist watches were once expensive.

It isn't usually the gee-whiz new technology that catches people up when they try to predict the future. It's not realizing how much of what they're used to will be obsolete.