It's a good idea to learn something new regularly. The smartest and most informed people I know tend to listen to the news, read frequently, and always seem to be up to date with current events or something new that is happening. They do not allow themselves to get stuck in their knowledge and skills. You don't need to do this too complicated. You don't need to solve a math problem that has puzzled mathematicians for centuries. You can simply learn a little each day. Over time your knowledge will add up and you will be much more informed.
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