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I don't even know what a slide rule looks like...how's that for a mom of a 7yo math whiz???

Don't feel bad, I didn't either! Despite the fact that Robert Heinlein was a huge proponent of them, I'd never even seen one, much less learned to use them.

My son handed it to me and said, "you were in the 60's, how does this work?" smile

Umm, I was barely in the 60's, and they were gone before I started school, sorry kid!