Where did I park the car? What time is my dentist appointment? Did I lock the doors? Oh no, it's Mom's birthday tomorrow! We are all very familiar with forgetting. It's incredibly frustrating, and sometimes it seems like your brain just isn't working. But it turns out that forgetting is just important as remembering; and it's actively regulated. Forgetting ensures that unnecessary information is removed from the brain, and is critical for its normal functioning.