Chilled out

THE idea came to Ralph Liedert while he was sweltering in the Californian sunshine, having been standing with his daughter for over an hour in a queue for a ride at Disneyland. What, he thought, if his T-shirt had a cooling system he could switch on, at the tap of a smartphone app, when he needed it. No doubt similar thoughts have crossed the minds of many a parent in such circumstances. They, though, did not have the means to make their dream reality. Mr Liedert does, for he works at the VTT Te...