The Project X team explores the physics of flight. The video program examines machines, such as a hang glider, to illustrate the principles of flight. Also, how a human body, such as an alpine ski jumper, must be streamlined to increase drag and how ski jumpers spread themselves out to optimize lift. The scientists examine bats to determine how they can fly when a wing is torn or punctured. By studying bats, the U.S. military is collecting the data on the principles of flight to improve their machinery.