Even some of the professional tools are within reach for smart high school students. Robert Nay, 14, became the talk of the Web when his iPhone game called Bubble Ball reached the top of the charts. He used Corona, a toolkit from Ansca Mobile that makes it relatively simple to create objects that behave as if they’re in the real world. Many of the rules of physics are already encoded and the programmer only tells the objects where to go, not how to bounce. Corona comes with a built-in ‘physics engine’ that fills in the details.