He is using The Spacing Effect.
Who is Ricardo?
He was given that name in honor of Ricardo Milos, a man best known for the dance video that became one of the most popular 2018 and 2019.
What is spacing effect in psychology?
The phrase "spacing effect" refers to the discovery that learning events spaced out over time rather than all occurring at once improve long-term memory (the first study on the spacing effect was conducted by Ebbinghaus in 1885/1964).
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