Superstrings and Other Things : A Guide to Physics, Paperback by Calle, Carlos I., ISBN 1138364886, ISBN-13 9781138364882, Brand New, Free shipping in the US This fully updated third edition continues to take readers on a uniquely accessible journey through physics, explaining the basic concepts of motion, energy, and gravity, right up through the latest theories about the structure of matter, the origin of and structure of the universe, and the beginning of time.