52:09
Who's Afraid of a Big Black Hole?
Black holes are by definition invisible, and there is no scientific theory that can adequately explain them. Nevertheless, researchers are determined to unravel the mysteries of black holes in the hope of answering some of the universe’s most pres...
31:32
The Nature of Matter
An elephant and a racing car don’t have much in common—except for the remarkable fact that they’re made of similar fundamental building blocks. This program takes a simulated subatomic look at a glass of water to better understand the nature o...