Nobody under 40 knows what a slide rule is.
I would've thought the same thing but . . .
Maybe six months or so ago, Scientific American ran an article by Cliff Stoll on the history of the slide rule where he effectively said the same thing - the slide rule has gone the way of the dodo bird. A couple of issues ago, a mid-twenties Marine First Lieutenant Firing Officer in Fallujah wrote in saying that they're still using slide rules to check the solutions provided by their $40,000 targeting computer as well as a failsafe backup.
The slide rule will never die.
Slide Rules for us seasoned engineers were also called "slipsticks."
I keep one in my office, and use it occasionally too. I get some funny looks from some of the other engineers, but sometimes it is faster than a calculator and gives me all of the precision I need.