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Just understanding how a problem was solved does NOT necessarily create a chunk that you can easily call to mind later.
(That’s part of why you can grasp an idea when a teacher presents it in class,
but if you don’t review it fairly soon after you’ve first learned it, it can seem incomprehensible when it comes time to prepare for a test.)
- Leaning How to Learn: Powerful mental tools to help you master tough subjects. Coursera.org.