You need another comma after the word "think" because it's a parenthetical expression and is set off from the sentence.
Answer:
He claims that schools are not places for children to learn, develop, and flourish. Rather, he argues that schools are designed to suppress children; to dehumanize them and restrict them from growing up and becoming adults. Some of Gatto's criticism is fair.
Answer:
Everyone, regardless of their culture or age, enjoys humor. However, psychology has only recently recognized it as a crucial, fundamental human habit.
<span>Typically, he leaves the stage.</span>
