The first rule is that you can't really know anything if you just remember isolated facts and try and bang 'em back. If the facts don't hang together… - Charlie Munger

The second helpful notion mimics Galileo’s50 conclusion that scientific reality is often revealed only by math as if math was the language of God. Galileo’s attitude also works well in messy, practical life. Without numerical fluency, in the part of life most of us inhabit, you are like a one-legged man in an ass-kicking contest.

It is remarkable how much long-term advantage people like us have gotten by trying to be not stupid instead of trying to be very intelligent.

Without numerical fluency , in the part of life most of us inhibit , you are like a one-legged man in an ass-kicking contest.