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Mar 7, 2021 at 3:49 comment added ryang @AlanCampbell There are also studies suggesting that adoitness at mental arithmetic merely masks early stages of Alzheimer's. But for sure, one must use their brain to grow (and maintain) their brain, especially during the developmental stages.
Mar 5, 2021 at 2:23 comment added Alan Campbell There's one more argument in favor of mental arithmetic: mental exercises are useful in combating Alzheimer's. Puzzles, crosswords, and Sudoku are all examples of mind exercises.
Mar 2, 2021 at 15:12 history answered David Mulder CC BY-SA 4.0