In the second episode of this six-part science series, Dara O Briain and his team of experts take us on a mind-altering journey around theoretical physics, with a look at the father of modern physics himself, Albert Einstein.

Dara finds out if you can measure the speed of light using cheese on toast, while physicist and oceanographer Helen Czerski hunts down Einstein's elusive gravitational waves, which have been mystifying scientists for years.

Plus, resident materials scientist Mark Miodownik takes a fridge apart, special guest Marcus Brigstocke attempts to get to grips with dark energy and some of the biggest brains in science are brought to bear on the eternal problem of tangled earphone wires.

Combining lively and in-depth studio discussion with exploratory films and on-the-spot reports, Dara O Briain's Science Club takes a single subject each week and examines it from lots of different and unexpected angles from sex to extinction, Einstein to space exploration and brain chemistry to music. It brings some of the world's foremost thinkers together to share their ideas on everything, from how to avoid asteroid impact to whether or not we are still evolving. Show less