Headache, medication or stimulation for the brain?

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There is something unnatural in calling the puzzles a puzzle, because they don’t break, but on the contrary, they strengthen, build and systematize – neuronal connections, attention, logic of thoughts. They are almost perfectly inserted into the well-known phrase of Lomonosov about mathematics: "The puzzles are already worth loving that they make the mind good," right?

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# Psychology
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