James Whelton, co-founder of CoderDojo, talks to  pupils at Colaiste Bride, Clondalkin, Co Dublin. Photograph: Eric Luke

The world loves a geek-schoolchild-to-tech-millionaire story. Such tales bring together the perfect mix of surprise and wonderment (and usually(...)

 Yahoo! has bought an app from teenager Nick D'Aloisio   in a deal believed to be worth tens of millions of pounds. Photograph: Lewis Stickley/PA Wire

Got a tech idea and want to make a fortune before you're out of your teens? Just do it, is the advice of the London schoolboy who's just sold h(...)