I was tempted to introduce them into the concept of Sats and pull out the gold kilogram vs. ounce (or gram) comparison.
I didn't do it for my own sake. Would have been like teaching a turtle how to ride a donkey

I fully understand you!
(I've learned that it's not healthy to assume a certain level of comprehension, especially in the "real world".)
Because there's quite a chance you may have more success with the turtle...