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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, and oceanographer Helen Czerski hunts down Albert Einstein's elusive gravitational waves - which have been mystifying scientists for years. Materials scientist Mark Miodownik takes a fridge apart, 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 headphone wires.