Welcome to the new series of the Big Questions podcast, where we ask Oxford scientists to shed light on everyday questions that you really want to know the answer to.   Remember those photos or videos online that don’t look quite right? Perhaps you’ve heard a celebrity’s voice somewhere unexpected? In this episode, we chat to computational social scientist Dr Bernie Hogan from the Oxford Internet Institute about deepfakes; media synthetically generated by technology to capture someone’s likeness. As AI and machine learning technology develop rapidly, how can we regulate the creation of deepfakes to know what is real? Tune in to find out!