One book I found that was incredible was _Mathematics for the Million_ (3rd edition, from 1951) that's part mathematics book, part history book. It goes over t

One book I found that was incredible was _Mathematics for the Million_ (3rd edition, from 1951) that's part mathematics book, part history book. It goes over the history of mathematics from ancient Egypt going forward, showing how only how math works (geometry, trig, algebra, the calculus) but how it was discovered and evolved over time.