Rejuvenate your brain with simple calculation exercises.
Train Your Brain: 60 Days to a Better Brain was a number-one bestseller in
Japan, even outperforming the Harry Potter books at one time. And now, after
selling over a million copies and inspiring countless copycats in its home
country, this revolutionary title is available in an English-language edition!
ISBN: 978-1933241463
ISBN: 1933241462
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