How do you feel about the problem of forgetting things you read /sci/? Should you return to textbooks you already studied years later for a refresher, or should you just keep reading assuming if it's important you will learn it again anyway? How about reading loads of animal facts, yet soon forgetting them again? Is there a point in reading them if they soon go away, or is it good to read them anyway to help you understand? What do you think? Note: I'm not really talking about stuff to use techniques like mnemonics or memory palaces for, just a normal kind of memory that's part of your understanding.