What is stuff made of? That is the question that this award-winning documentary sets out to answer. What are the building blocks of all the matter on earth, and throughout the universe? The once ' solid' atom was found to be mainly empty space, with a nucleus at its centre, and electrons whizzing round its perimeter. Then the nucleus itself was found to contain its own particles, the neutron and the proton. And one of the great discoveries of the 20th. century was that the protons themselves are made up of quarks. But now ' strings' ...tiny vibrating threads.... are proposed as being the ultimate basis of all the matter and all the forces in the universe. This programme takes you to the very frontier of science to unravel the mystery of 'strings.'