We learned about the experiments of Karpicke and Blunt in (3.4.2) Learn more after testing. In the experiments, subjects learned during the day and tested in a week. The memory is judged by whether or not they can recall after a week. If you are studying for the exam after one week, it is beneficial to raise the score in a week. However, in the long run, one-week memory is useless. We need to keep memories for many years. Let's explore how we can create memories that last longer.

Keyword: spaced repetition