1. Play chess, checkers and poker
These games can not only make you richer, but also perfectly develop thinking. If you think that you play chess too well, try to play more for a while so that it takes no more than a minute to make a decision.30 easy ways to get smarter
2. Develop your numerical sense
Yes, yes, you already have this. Pull out a handful of trifles from your pocket, glance at...