Fatty food, Event horizon of a black hole, Gene editing technology patents

Adam Rutherford looks at new evidence on what controls our preference for high fat food. There's a genetic detective story of giants in Northern Ireland. Adam also talks to one of the astrophysicists hoping to capture the first image of the event horizon of a black hole with a telescope that's the size of the Earth, and he hears about the patent battle over the revolutionary gene editing technology known as CRISPR-cas9.