Cookwise: The Secrets of Cooking Revealed
If, like me, you need to know the why as well as the how, this book is for you. The physics and chemistry behind cooking are explained in simple, erudite terms. It's not a cookbook, though there are recipes. Rather, it's edutainment. You should get college credit for reading this.
Honestly, I can't decide between "Cookwise" and "Bakewise."