Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Robert Kelly is managing director of XTS ...

Beijing shop clerk Gao Shunxiang has been using an abacus at work for 28 years. He could end up being part of the last generation of abacus users in China. Cui Meng / China Daily The abacus faces ...