This week, we’re going on a search for the theory of everything.The two main theories of physics are at odds with one another. Einstein's general relativity explains gravity, but it contradicts quantum theory: how we understand matter, atoms and particles.Theoretical physicist at Imperial College London Professor Fay Dowker has been working on a solution to this quantum gravity problem, and tells us why the theories are incompatible, and how she plans to bring them together.If you have a burning science question you want an expert to answer, send them to us on twitter at @sciencefocus, and we may answer them in a future episode.Subscribe to the Science Focus Podcast on these services: Acast, iTunes, Stitcher, RSS, OvercastLet us know what you think of the episode with a review or a comment wherever you listen to your podcasts.Listen to more episodes of the Science Focus Podcast:Dr Erin Macdonald: Is there any science in Star Trek?Dr Becky Smethurst: How do you actually find a black hole?Kathryn D. Sullivan: What is it really like to walk in space?Hannah Fry: How much of our lives is secretly underpinned by maths?Robert Elliott Smith: Are algorithms inherently biased?Monica Grady: What is the future of space science? Hosted on Acast. See acast.com/privacy for more information.