Graduate school can be a traumatic experience.
Some graduate students spend their time complaining about a heavy work load, uncaring attitudes of faculty, or constant pressure of being evaluated. Graduate school for these people is an unpleasant experience to be endured, survived, and forgotten as quickly as possible. Another group seems to thrive on their graduate education. These are the graduate school superstars. Superstars were observed to be physically present in the department, during and often after working hours.