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French people greet each other with a kiss (or more, depending on the geographical location where you are). But this is not valid in more formal contexts. We do not kiss our superiors or strangers, we shake their hands. A woman can faire la bise to another woman or a man, a child to everyone, a man to a woman or a man who is his close family members (father or grandfather). In case the professor greets the protagonist, he would shake his hand.
