 It might have been Rabbi Sachs who talked about a book called Mindset. Have you guys heard of that book called Mindset? No. No. So basically, he did an experiment, or this woman, Carol Dweck, did an experiment where she gave a puzzle to a group of 10-year-olds. And there were some kids, when they got the puzzle and it became too difficult for them to do, they basically got bored.