Sometimes people forget common sense. People don't realize that, just like any other skill, logic can deteriorate over time if it isn't practiced. Just like math, you can forget how to think quickly and find a solution. It is recommended that people often read or spend time outdoors, camp in the woods, or go to social gatherings in order to keep their mind from losing intellectual quotient (IQ). Go out and see the world, try new things, meet new people.