The forgetting curve hypothesizes the decline of memory retention in time. This curve shows how information is lost over time when there is no attempt to retain it.
Our brain forgets quickly newly learned information. Spaced repetitions are the most effective approach to internalize.
Explore more quotes
The speed of forgetting depends on a number of factors such as the difficulty of the learned material (e.g. how meaningful it is), its representation and physiological factors such as stress and sleep. Furthermore higher original learning also reduces forgetting. The rate differs little between individuals.
My generation of playwrights have grown up writing for studio theatres, and so the task of writing for more than ten or so actors is a huge challenge. Logistically, it's like doing an enormous Sudoku. Making sure everyone is in the right place at the right time in the right order instantly sends me into a cold sweat.