Data-driven journalism is a big topic being taught at “J” (or, journalism) schools these days. What does this mean? Using data – charts, graphs or even explanatory text – to tell a complicated story in a few easily understood images. Here’s how it’s done.

The terror attacks in Mumbai shocked the world at large on more than one level. The violence, injury and loss of human life which we brace ourselves for every time something like this happens somewhere …