“iron rusts from disuse, stagnant water loses its purity and in cold weather becomes frozen, even so does inaction sap the vigor of the mind.” …were the words of one of the greatest thinkers of his time: leonardo da vinci. recently scientists have discovered a new way to improve cognitive abilities using specially designed exercises. calculator is one such exercise specially desi…show more“iron rusts from disuse, stagnant water loses its purity and in cold weather becomes frozen, even so does inaction sap the vigor of the mind.” …were the words of one of the greatest thinkers of his time: leonardo da vinci. recently scientists have discovered a new way to improve cognitive abilities using specially designed exercises. calculator is one such exercise specially designed to train your calculus skills and is part of the neuronation training program. in calculator you have to fill out the missing signs and numbers in equations as fast as you can. you only have one minute. in order to improve in this exercise you must concentrate on multiple equations at a time.show less
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