Why didn't any one tell me about this book when I was younger! This is so good. :)
As someone who struggled through calculus, this book would have made a huge difference for me. Just reading through the first few pages brought a smile to my face that someone could so plainly explain these critical concepts in such a familiar way. Why didn't my professors do that?
Because to them it's obvious. Most maths teachers are so far ahead of the students they forgot they once were students themselves.
I've had 3 different ones in high school and the difference was incredible. All the way from 'only the best students learn anything' to 'everybody earns at least a passing grade'.
Maths and physics were the classes where the quality difference between the teachers stood out the most.