These Indian kids don't need a calculator to solve mathematical operations in just seconds. They do it all in their heads using a mental abacus—an old Asian technique that allows them to visualize an imaginary abacus and operate it to perform the calculations.
From the abacus to the IBM personal computer, calculating devices have come a long way. Let's take a look through the history of these machines and the remarkable progress that came with the 20th century.
Let's get one thing straight. We were about to write off SPOT. The technology, while very cool, has thus far been limited to a few geek watches and weather stations that the average Joe—the guy who might want to wear a watch rather than check the time on his cellphone—would consider picking one up.