5.0

I really enjoyed this book, and let me tell you why. One, it broke into plain english what calculus is there for. It is basic simple math, and why it's important.
Second, it gives a history of math that gives credit where it is due, which is that it wasn't all European-centric. There are places, like the Middle East, India, and Asia for the progress we were able to make to getting to the point where we have calculus.
Third, it isn't all male, which is great. It also give reference to the fact that social factors rather then talent is why there are fewer women in the record for doing great math (but even despite that there have been great mathematicians who have been women, here's to more).
Forth, and lastly, it covers why math, and calculus in particular, are still relevant and why there might still be more discover. Just because we think we know something doesn't mean we do.