Health care startup Theranos hit with dose of doubt

Was the story too good to be true? Born in the US capital, Elizabeth Holmes took the crown of youngest "self-made" woman billionaire thanks to revolutionary blood tests touted by her Silicon Valley startup Theranos.

Tech sector tackles America's concussion epidemic

A number of technology startups are devising creative new ways of detecting concussions in pro and amateur athletes, using apps, tablets and sensors to monitor the often debilitating brain injury.