Take a common sense quiz about 10 questions a day.
With 10 questions, you can acquire knowledge you did not know.

* You can solve scientific/economic/social/political/cultural/historical problems by category.
Communication between people on the subject you want will be smooth.

* Check out the issues I didn't know with bookmarks!
If you get a problem you don't know while solving the problem, check it and go to the bookmark page later.
You can check the problem.

* Solve only bookmarked problems!
By solving the problem identified with bookmarks, you can upgrade my knowledge.
can.

Simply take the quiz from anywhere without complicated login.