The widow of a scientist who killed himself in fear he was about to lose his job at troubled bio-tech start-up Theranos has told of the company's paranoid culture. Ian Gibbons, the head scientist at the blood test company, died after taking an overdose of painkillers in May 2013 within hours of being summoned for a meeting. According to his widow, Rochelle, he had found faults in machines the company claimed would 'change the world' by being able to diagnose diseases from a single pinprick of a patient's blood. Having recently been diagnosed with cancer, he stopped going to work...