Not many kids have made it through childhood without ever snapping two LEGO bricks together, but now they get a second chance: the most popular and profitable toy company is building a bridge to reach frazzled, stressed-out adults. LEGO has endured wave upon wave of high tech gadgetry vying for kids’ attention, from video games to mobile phones and the internet, but now the Danish company is structuring a whole line of sets with instruction manuals for adults who need to give