Share a memory or fact that you have always remembers and you believe that it is

Share a memory or fact that you have always remembers and you believe that it is in stored in your long term memory. What are some of the reasons that we forget? What is is called when someone must be in the same psychological state they were in when they first came into contact with this information to remember it? Can you think of any examples of this phenomena happening to you? Sometimes when we study material for an upcoming test, there is multiple different subjects that we must learn. When later information learned interferes with the earlier information learned, this is called? Who believed that we repress or forget certain ideas, feelings, or experiences is they are too painful to deal with on a conscious level?