In Calculating the Cosmos (Basic Books, $27.99) award-winning scientist and math popularizer Ian Stewart takes the majesty and complexity of our universe and explains it, bit by bit, according to how the numbers add up. In addition to showing how math helps us understand the cosmos as it is (and will be), Stewart also humanizes and contextualizes our history of calculations. Through short summaries he explains how we came to better understand the universe, detailing our record of insights, mistakes, recalculations, and lucky guesses. Discussing everything from how the bodies in our solar system affect each other to whether dark matter exists, and on to speculations about how new discoveries may guide future deep space exploration, this book is for anyone who is fascinated by looking at the stars and wants to better understand their—and our—place in the universe.