From preeminent math personality and author of The Joy of x, a brilliant and endlessly appealing explanation of calculus – how it works and why it makes our lives immeasurably better.
Without calculus, we wouldn’t have cell phones, TV, GPS, or ultrasound. We wouldn’t have unraveled DNA or discovered Neptune or figured out how to put 5,000 songs in your pocket.
Though many of us were scared away from this essential, engrossing subject in high school and college, Steven Strogatz’s brilliantly creative, down‑to‑earth history shows that calculus is not about complexity; it’s about simplicity. It harnesses an unreal number—infinity—to tackle real‑world problems, breaking them down into easier ones and then reassembling the answers into solutions that feel miraculous.
Infinite Powers recounts how calculus tantalized and thrilled its inventors, starting with its first glimmers in ancient Greece and bringing us right up to the discovery of gravitational waves (a phenomenon predicted by calculus). Strogatz reveals how this form of math rose to the challenges of each age: how to determine the area of a circle with only sand and a stick; how to explain why Mars goes “backwards” sometimes; how to make electricity with magnets; how to ensure your rocket doesn’t miss the moon; how to turn the tide in the fight against AIDS.
As Strogatz proves, calculus is truly the language of the universe. By unveiling the principles of that language, Infinite Powers makes us marvel at the world anew.

In January 2002 Rory Stewart walked across Afghanistan-surviving by his wits, his knowledge of Persian dialects and Muslim customs, and the kindness of strangers. By day he passed through mountains covered in nine feet of snow, hamlets burned and emptied by the Taliban, and communities thriving amid the remains of medieval civilizations. By night he slept on villagers' floors, shared their meals, and listened to their stories of the recent and ancient past. Along the way Stewart met heroes and rogues, tribal elders and teenage soldiers, Taliban commanders and foreign-aid workers. He was also adopted by an unexpected companion-a retired fighting mastiff he named Babur in honor of Afghanistan's first Mughal emperor, in whose footsteps the pair was following.
Through these encounters-by turns touching, con-founding, surprising, and funny-Stewart makes tangible the forces of tradition, ideology, and allegiance that shape life in the map's countless places in between.

Arnold Toynbee's A Study of History has been acknowledged as one of the greatest achievements of modern scholarship. A ten-volume analysis of the rise and fall of human civilizations, it is a work of breath-taking breadth and vision. D.C. Somervell's abridgement, in two volumes, of this magnificent enterprise, preserves the method, atmosphere, texture, and, in many instances, the very words of the original. Originally published in 1947 and 1957, these two volumes are themselves a great historical achievement. Volume 1, which abridges the first six volumes of Toynbee's study, includes the Introduction, The Geneses of Civilizations, and The Disintegrations of Civilizations. Volume 2, an abridgement of Volumes VII-X, includes sections on Universal States, Universal churches, Heroic Ages, Ccontacts Between Civilizations in Space, Contacts Between Civilizations in Time, Law and Freedom in History, The Prospects of the Western Civilization, and the Conclusion. Of Somervell's work, Toynbee wrote, "The reader now has at his command a uniform abridgement of the whole book, made by a clear mind that has not only mastered the contents but has entered into the writer's outlook and purpose."