This book is interesting for it's friendly approach and sometimes just a wee bit over the top fun filled phrases and attempts to make it all very catchy and cute. I am glad to see much of the new work out there which attempts to make mathematics more accessible for everyone, but I do wish we could see more people first starting with applications that need doing, and then moving to the mathematics that is needed to build the apps (building, house, structure or non-physical apps), and breaking the mathematics down on an as-needed basis rather than insisting on teaching mathematics before the various disciplines or sections of mathematics are actually needed for practical application.
Page 353 has a neat example of the four-color problem.