In this 3rd episode of Atom 'The Illusion of Reality', scientists explore how reality is just an illusion...The most important scientific discovery of the twentieth century, the discovery of the atom is explored in The Atom. Presented by physicist Dr Jim Al-Khalili, the series will delve into the thrilling human drama at the heart of the most extraordinary scientific revolution of all time.Al-Khalili explores how studying the atom forced us to rethink the nature of reality itself, encountering ideas that seem like they are from science fiction but in fact are a central part of modern science. He discovers that there might be parallel universes in which different versions of us exist and finds out that empty space is not empty at all, but seething with activity.