There is no sure-fire, never-fail road map for research. There certainly is no GPS with a reassuring British voice guiding you when you make a wrong turn (“recalculating…”). Research takes you into unexplored, wild, rocky terrain, and each book teaches you how to research that book. Sure, there are techniques...

I love chocolate. I love fruit. But I prefer to enjoy them separately. If, on the off chance, I do bite into a clever combination of the two, it is generally after I’ve been given some kind of heads-up — perhaps one as simple as the label on the inside...