Categories
- Art (356)
- Other (3,632)
- Philosophy (2,814)
- Psychology (4,018)
- Society (1,010)
Recent Questions
- Why did everyone start to hate the Russians if the U.S. did the same thing in Afghanistan, Iraq?
- What needs to be corrected in the management of Russia first?
- Why did Blaise Pascal become a religious man at the end of his life?
- How do I know if a guy likes you?
- When they say "one generation", how many do they mean?
I think this site will suit you 4brain.ru Russian-language, modern design, a lot of different courses, books and, in general, everything that a person needs who is thinking about self-development.
And by the way, why did you come up with puzzles? So that people who do not know the mathematical apparatus, too, somehow trained their brains. I have often heard from teachers that in their youth, in their spare time, they solved problems from various collections of problems, for example, from the famous Demidovich – this is self-development!
Of the Russian-language sites with math problems, the site is out of competition problems.ru There are a lot of non-standard tasks of various levels, designed for all ages. True, orientation in it requires some professionalism.