You might ask: Why do I need to do this? If I already knew something, why bother researching it?
When you think about what you already know, you’re preparing your brain to make connections between this stored information and new information. For example, you may already know that there are different types of wasps, but you didn’t know that European Hornets are the only type that will fly at night. Or, perhaps you knew that wasps were social insects but didn’t know that female workers were the only type of wasp that leaves the hive to find food.
Connecting this new information to what you already know will help you remember it.