As we get older, it's important to keep exercising our brains. At age 16, and still in high school, I am forced to constantly utilize my brain in everyday math problems and chemistry equations. However, for the elderly, or for people who just want to prevent Alzheimer's Disease and other forms of dementia, stimulating the brain little by little daily can be tiresome. These brain teasers can range anywhere from simply brushing one's teeth with the non-dominant hand, to practicing math equations and spelling words on a Nintendo DS on the airplane.
For 75-year-old Albert Clay, his daily brain exercise consists of multiplying pairs of 5-digit numbers in his head. I don't know about you, but the most I can multiply in my head is probably the normal times table - the highest I can go up to at this point is basically 15 times 15 (which is 225). How is it possible that Mr. Clay can multiply numbers such as 25679 x 31456? Which, according to my calculator, is 807,758,624! Clay's method can be learned for $33 - How to Multiply Any Number by Any Number in Your Head.
I wish I could do that kind of math in my own head...maybe it'd help me pass Pre-Calculus this year.
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