God's Equation: Einstein, Relativity, and the Expanding Universe

God's Equation: Einstein, Relativity, and the Expanding Universe - Amir D. Aczel The book was originally published in 2000. The only flaw with the book is that I listened to it in 2012. He explains the general theory of relativity so well that you will be able to explain it to others. He explains its relevance to the than recent discovery of the expansion of the universe and dark energy.

This book is well worth your time. Isaacson's Einstein biography better covers the general theory but is 21 hours long, and the "4 Percent Universe" covers the expanding universe and dark energy better, but this short book can be a good review or primer for those two books depending on which order you choose to read them.