Why You Need to Finish Your Puzzles"It was, I believe, my introduction to the scientific process. With each piece, I’d reason: if not here, then here, and if not here, then here, and…so on. Puzzles forced me to look again, and again, and possibly again because each piece---no matter how small or seemingly insignificant---was critical to the whole."
From: When Crickets Cry by Charles Marlin
(Good book, by the way. I got it from the library.)