From the reviews:
“This book explains gravitation for readers who do not necessarily have a strong mathematical background. Its scope goes well beyond ordinary popular science accounts. Besides the science, it also gives insights into historical and personal perspectives. It contains many very helpful illustrations and diagrams. … For the unknowledgeable reader, this provides interesting insights into the mechanisms of scientific discovery as they are confronted with current disputes and diverging viewpoints.” (Carla Cederbaum, Zentralblatt MATH, Vol. 1262, 2013)
From the Back Cover
This richly illustrated book is unique in bringing Einstein's relativity to a higher level for the non-specialist than has ever been attempted before, using nothing more than grade-school algebra. Bondi's approach with spacetime diagrams is simplified and expanded, clarifying the famous asymmetric aging-of-twins paradox. Einstein's theory of gravity, general relativity, is simplified for the reader using spacetime diagrams. The theory is applied to important topics in physics such as gravitational waves, gravitational collapse and black holes, time machines, the relationship to the quantum world, galactic motions and cosmology.