Which brings up one of my pet peeves... the claim that all sf predicts something.
Even the Grand Masters never predicted home computers, their futures had kids take calculus in elementary school, with slide rules.
Uhm, old bamboo item to work with log tables.
What are log tables ?
Uhm. You'll just have to look it up.
a web page with an actual photo of a slide rule:
http://mysite.du.edu/~jcalvert/tech/slidrul.htm