We've all seen them. People riding the bus, standing in line at the post office or just walking down the street, all of them oblivious to the world around them as they fidget with their iPhones and their Androids. And they're not just checking e-mail any more. They could be doing almost anything, from invoicing a client to editing Christmas videos to learning verb tenses in Mandarin Chinese.
This is all possible thanks to the multitude of applications --- or "apps" --- now available for handheld devices. The first iPhone only had 11 apps pre-installed when it debuted in 2007, but what a difference a couple of years makes. The amount of available apps on the market now numbers in the thousands, with no sign of slowing down.
How much do you know about apps? Take the following quiz and find out.
Posted 8 Jan 2010