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So you've been passed over again at work for that promotion you wanted. You're so angry that you can't get any more work done today, so you've come to HowStuffWorks to spend the rest of the day doing quizzes. Maybe understanding anger might help you to relax!
Of course they can. They do it every day when they wag and meow their undying love for you. Why are pets such a solid prescription for smiles?