The key to ego fatigue lies in our blood sugar levels. For example, children who go to school without breakfast are more behavior-sensitive than those who have had good breakfast.
Positive thinking makes life easier, but the key to success is discipline. Fortunately, one can practice discipline by training one's willpower.
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Comics have a problem, and that is continuity - the obsession with placing the characters in an existing world, where every event is marked in canon. You're supposed to believe that these weepy star boys of now are the same gung-ho super teens fighting space monsters in the '60s, and they've only aged perhaps five years.