These days, we use calculator extensively. We have become so dependent that we don’t want to do a simple calculation without it. And why to do when we have a calculator readily available. It decreases the chances of mistakes converted into financial loss during transactions.
But, very few people are aware about it’s origin and evolution. The first calculator came into existence was a calculating clock. It was invented by Wilhelm Schickard in 1963. Prior to it, Blaise Pascal who developed ‘Pascaline’ was regarded as the inventor of any calculating machine.
One can read more information here: http://www.edtechmagazine.com/k12/article/2012/11/calculating-firsts-visual-history-calculators