Simple and enjoyable way of effective learning with flashcards based on spaced repetition.
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Practice when you need to.
The scheduler algorithm determines the next appearance of the card. In fact, if you are brave enough, you can write your own algorithm.
Create your own deck and share it with others. Or just browse the gallery and practice the ones you like.
Motivate yourself to achieve continuous performance every day and get rewards for persistent practice.
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Spaced repetition
"Spaced repetition is an evidence-based learning technique that is usually performed with flashcards. Newly introduced and more difficult flashcards are shown more frequently while older and less difficult flashcards are shown less frequently in order to exploit the psychological spacing effect. The use of spaced repetition has been shown to increase rate of learning."
Read this and more at Wikipedia.