Two pioneer balloonists, Tom Gatch in 1974 and Larry Newman in the early 1990s, led widely reported stratospheric expeditions that nearly earned them a place in aviation history. They both used pressurized balloons, a dangerous and sophisticated type of aircraft, and sought the swift wind of the jet stream to carry them forward. In the first story, a determined, self-financed and self-reliant Tom Gatch in his Light Heart tries to become the first...