أرسل هذا في رسالة قصيرة: The science of effective learning with spacing and retrieval practice

  _  _     _____     _  __     ___      ______  
 | \| ||  |  ___||  | |/ //   / _ \\   /_   _// 
 |  ' ||  | ||__    | ' //   / //\ \\  `-| |,-  
 | .  ||  | ||__    | . \\  |  ___  ||   | ||   
 |_|\_||  |_____||  |_|\_\\ |_||  |_||   |_||   
 `-` -`   `-----`   `-` --` `-`   `-`    `-`'