Keeping the kids occupied is never easy. You don’t want to just plonk them down in front of the TV, but unfortunately you don’t always have the time to provide more stimulating activities like going out or reading together. Luckily, thanks to the development of apps on smartphones like the htc one x or the iPhone 4s and other mobile devices, kids can play and learn from a whole range of useful applications designed specifically for their enjoyment. Here are three of the best! An app for fun – Angry Birds You’ve probably already heard of Angry Birds! This family-friendly game became instantly popular when it was first released in 2009, and remains the number 1 paid iPhone app in over 50 ...