The spacing effect: http://www.wired.com/medtech/health/magazine/16-05/ff_woznia...
The testing effect: http://psych.wustl.edu/memory/Roddy%20article%20PDFs/Roedige...
The spacing effect: http://www.wired.com/medtech/health/magazine/16-05/ff_woznia...
The testing effect: http://psych.wustl.edu/memory/Roddy%20article%20PDFs/Roedige...