Sudoku is a great puzzle to try to solve and it expands your thinking. These can be purchased in books, are often printed in newspapers, and are easily found for free online.

Try teaching yourself. You can even learn from your life experiences, sometimes called “unschooling”.

If you can read much faster than you can speak, it is much more efficient to read a book, or better yet a non-linear electronic document like a wiki than to watch a show for all but the most intellectually demanding or video-dependent learning. Commercial television is particularly bad because its ultimate purpose is to do just enough to keep you at the TV and its ads, not satisfy you so you can do something else.

Constantly work hard to achieve each of your goals. Without goals, you would have nothing to hope for. Reward yourself after accomplishing your goal. Be organized. You don’t need to be a total neat freak, but wasting time is not smart. Of course, many geniuses are completely disorganized (think of the absent-minded professor) but if you’re making an active effort to be smart, taking a conscious approach to how you spend your time is a big step in the right direction.