Contagious smiling (and frowning and scowling and so on) is the basis of reading others' emotions and registering how you should, in turn, feel.
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I've done a few costume dramas, and people say, 'What was it like wearing the costumes? Did they really help you with your character?,' and most of the time it doesn't make any difference. You're wearing something a bit weird, and it's sort of uncomfortable, but it doesn't really have a huge impact on the part that you're playing.
Many adult book authors supplement their income by teaching at the college level. Full-time professors fare well, but pay for adjunct professors is notoriously shabby. Children's book authors have a sweeter deal. We're invited by schools, libraries, law firms, and Fortune 500 companies to share our best writing tips and strategies.