Long-term memories may be accessible for years, but may be more difficult to recover. Information about something that happened a long time ago can be difficult to remember, and it takes work to locate it in long-term memory. Unlike short-term memory, information stored in long-term memory remains in the human mind for a long time and can be easily accessed because it has meaning. A person will not remember a multiple choice history test, unless the test was significantly important to that person, they will remember the extraordinary trip with six other friends to Yosemite National Park. People store long-term memories that are meaningful to them, whether they are happy or traumatic, and whether they want to remember something or not. If something truly traumatic happens to someone that is too painful to think about, he or she may forget what happened in the traumatic event because it is too psychologically stressful for him or her to remember. The memory will be impossible to retrieve from long-term memory because it is too disturbing and they don't want to remember it. If something fantastic happens to someone and thinking about it brings joy, the memory will be preserved in the long term and will be easy to recover because there is a positive