What's the meaning of "stick"here?
His creativity and passion for making learning stick have compelled him to expand his contributions far beyond psychometrics, and you can find Mark’s trademark humor and gift for creating simple, memorable models throughout Inscape’s products.

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Hi Gaocaiping. In this case, stick means to stick or stay in people's minds. The statement is saying that the way that Mark presents his models to an audience is entertaining and that therefore what he is teaching is remembered by the audience. Hope this helps

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