Albert Einstein develops a theory of relativity with some help from his shaving mirror.
Frontiers this week looks at the latest candidates for a 'Theory of Everything'.
Writer Philip Ball meets the physicists who are making real life invisibility cloaks.
Carlos Frenk talks to Jim Al-Khalili about dark matter and modelling the cosmos.
Sue Nelson joins scientists down a mine on their search for the elusive dark matter.
Melvyn Bragg and his guests discuss dark matter, the 'missing mass' of the universe.
Ben Miller looks at dark matter, the strange invisible material that fills the universe.
Fay Dowker and Jim Al-Khalili discuss the texture of space-time.
Brian Cox and Robin Ince head to Mosi in Manchester and look at the invisible universe.
Melvyn Bragg and his guests discuss Einstein's theory of relativity.
Melvyn Bragg discusses the idea of symmetry in art and nature.
A symmetric partner to all the known particles could provide the key to understanding them
Melvyn Bragg explores the 30 year search to solve all the biggest questions in physics.
Brian Cox and Robin Ince return to discuss the next great mystery for particle physics.