Piers chats with maths PHD and university lecturer Dr Ian Storey about the mind-bending concept of infinity. Some infinities are smaller than others. Some are minute, like the infinite density of a black hole, while the universe seems to be endless and enormous. We consider the role of science fiction in pushing the boundaries of science and can't help ourselves from applauding 'Project Hail Mary' and the Artemis mission to the moon.