Professor Tim Spector is head of the department of Twin Research & Genetic Epidemiology at King’s College London. We interviewed him as as part of our #PassTheMic series. Here’s some of what he had to say in the interview. A few months ago, we launched a symptom study app that has gained amazing traction. More than 3.2 million people have given us data in the UK and another half a million in the US and Sweden. This showed us there are...