Yes, that was my take-away too. I suspect it's a wonderful way of teaching intuition for differences in scale, which is something that's a lot more important to

Yes, that was my take-away too. I suspect it's a wonderful way of teaching intuition for differences in scale, which is something that's a lot more important to us today than it was a few centuries ago. Easy mental guesstimates should not be underestimated as a valuable tool