People have been found to learn faster when they are in a state of flow because they are more focused and because their enjoyment of the activity creates a higher motivation to repeat it. Research on student engagement has found a direct connection between frequency of flow experiences and longer-term academic interest and motivation. Research has shown that students are more likely to experience flow while participating in cooperative learning activities and, in fact, studies both in high school and in college found that those group activities encouraged "high concentration and high enjoyment", both essential for flow. The Greek philosopher Plato wrote a thousand years ago that the greatest challenge for teachers and parents is to teach young people to find pleasure in the right things. He called it pleasure, but actually what he meant was enjoyment.