I remember when I was a child or young teen (~late 90s / 2000s) I had two books that were illustrated in a cartoon style. One covered math topics like the Fibonacci sequence, the golden ratio, googol. The other wasn't math related, but I remember reading about Zen, specifically that money rolls out of a house built on a hill with a straight driveway.
The illustrations were in a style very similar to "Everything Kids" books, but they were not workbooks, just for reading (I think).
I would very much like to find these books again. Does anyone know about them?