Master whatever you wish to memorize faster and better using this boxed flashcard repetition system, based on the pioneering work of Hermann Ebbinghaus and promoted by science writer Sebastian Leitner in the 1970s. While apps have their place, using your hands to make your own flashcards takes advantage of our kinesthetic senses to help us learn in a whole-body way. You can also benefit in a more casual application by simply returning missed answers to the first compartment, while advancing your correctly answered cards to the next compartment. Add a monogram or full-name for a personal touch. Learn more about the Leitner System and how to use it from our Co-Founder Steve Leveen on his .