Infinity of Worlds

I read it last year. I've heard "inflation" thrown around before, but never knew what it meant. I think this book does a perfect job of explaining it. It explains the foundations of cosmology that are generally accepted. It explains the observations that need a new explanation. It enumerates the proposed explanations and why inflation is the best. It covers testable predictions. And untestable possibilities, which are perhaps meaningless from a physics standpoint, but enjoyable to consider nonetheless.

All that is explained without maths. The author has a lecture series on YouTube that goes into the technicalities. But I certainly appreciated the simplified version!