This documentary series explores the history of science and how we found our place in the cosmos.

She's back. The Thirteenth Doctor is returning for the thirteenth series, a six-part Event Serial. Since their last epic battle in Revolution of the Daleks, the Doctor and Yaz have been exploring the universe together but with the Doctor now questioning everything about her past she will undoubtedly be searching for answers. Series Thirteen will introduce some terrifying new adversaries and the return of truly iconic old enemies. Expect action, fun,...

Calculus is the greatest mathematical breakthrough since the pioneering discoveries of the ancient Greeks. Without it, there would be no spaceflight, skyscrapers, jet planes, economic modeling, or accurate weather forecasting. One of the most powerful problem solving tools ever invented, calculus is a skill that can be learned. Its techniques are used to analyze situations involving change, to calculate optimum values, and to measure complex shapes....

There is more to the universe than meets the eye--a lot more. In recent years, scientists have discovered that 95 percent of the contents of the cosmos are invisible to our current methods of direct detection. Yet something is holding galaxies and galaxy clusters together, and something else is causing space to fly apart. Scientists call these invisible components dark matter and dark energy: "dark" because these phenomena do not emit light. Dark...