Do you know how to do mental arithmatics?
"All the mathematicians whose biographies are given in our archive exhibited extraordinary mental powers. In
this article we look at a few mathematicians who have shown extraordinary powers of memory and calculating. We also look at a number of people who had no mathematical skills, usually no education, yet were able to display feats of mental arithmetical skills which astounded their contemporaries and today still astound us." Via
HotLinks.