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 ExercisesOccasionally, and particularly in the early chapters, I'll pose a question to highlight
 the importance of the concept under discussion. They're not there just to take up
 space; I really do want you to try them before continuing. Please. So as not to
 dilute their importance, I've sprinkled only a few throughout the entire book. They
 also serve as checkpoints: if they take more than a few moments, it's probably
 best to go over the relevant section again before continuing on.To help entice you to actually think about these questions as you read them, I've
 made checking the answers a breeze: just click on the link. Answers to questions
 marked with  are always found by clicking on the link. This way, they're out
 of sight while you think about the answer, but are within easy reach.
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