"People Learn Best and Most Deeply When:
They try to answer questions or solve problems they find interesting, intriguing, important, or beautiful;
They can try to answer the question or solve the problems then receive feedback and try again before anyone "grades" them on their efforts;
They can work collaboratively with other learners struggling with the same problems; ..." (Best Teachers Summer Institute, June 20-22, 2012; retrieved January 27, 2012).