Your ears are lying to you right now. In this episode of The Rest Is Science, Professor Hannah Fry and Michael Stevens (Vsauce) dive into the bizarre world of audio illusions where your brain hears sounds that don't exist, fills in frequencies that were never there, and constructs a version of reality that simply isn't real. From the impossible endless ascending tone to the battle between your eyes and ears, explore how auditory illusions reveal the cracks in human perception. Along the way, we uncover how hearing works at a neurological level, why your brain edits sounds before you consciously register them, and what sensory perception research tells us about whether any of us truly experience reality as it is. Could the gap between what's real and what you perceive be wider than you think? The answer might change how you listen to the world. ------------------- For more information about Cancer Research UK, their research, breakthroughs and how you can support them, visit ⁠⁠https://cancerresearchuk.org/restisscience⁠⁠ Cancer Research UK is a registered charity in England and Wales (1089464), Scotland (SC041666), the Isle of Man (1103) and Jersey (247). A company limited by guarantee. Registered company in England and Wales (4325234) and the Isle of Man (5713F). Registered address: 2 Redman Place, London, E20 1JQ. ------------------- Video Editor: Oli Oakley + Teo Ayodeji-Ansell Animator: Sam Benson Video & Social: Bex Tyrrell Assistant Producer: Lucy Lipscombe Producer: Simona Rata Senior Producer: Lauren Armstrong-Carter Head Of Digital: Samuel Oakley Exec Producer: Neil Fearn