Introduces the scientific principles of light and color, including explanations of where light comes from, reflected light, colors in nature, and how the eye works.

Looks at the origins of our planet, how Earth began, what it is made of, and the cause of phenomena such as volcanoes, earthquakes, and changes in climate.

Learn what water is, how we use it, and why our world may be running dry.

Host Neil deGrasse Tyson will tackle one of science's major challenges in each video, framed as a simple question that ordinary people wonder and worry about. Neil will guide us as he explores dramatic discoveries and the frontiers of research that connect each central, provocative mystery. Episode includes: 1) How Smart Are Dogs? - Meet an extraordinary boarder collie and other dogs changing our view of canine intelligence. 2) How Smart Are Dolphins?...

In the course of an exciting experiment, the wizards of Discworld have accidentally created a new universe. Within this universe is a planet that they name Roundworld. Roundworld is, of course, Earth, and the universe is our own. As the wizards watch their creation grow, Terry Pratchett and acclaimed science writers Ian Stewart and Jack Cohen use Discworld to examine science from the outside. Interwoven with the Pratchett's original story are entertaining,...

"In The Science of Discworld, the wizards of Unseen University unwittingly created Earth (aka Roundworld) and our universe. At the time, they were so concerned with the rules of this new universe that they overlooked its inhabitants completely. Now, they have finally noticed humanity. And humanity has company: Elves, who want very much to take over human society. In this second installment in the Science of Discworld miniseries, Terry Pratchett and...