BASE-jumping pioneer Jeb Corliss is one of the original madmen, a fiend for the extreme who has miraculously survived multiple crash landings in a sport that rarely allows second chances. Now, at 44, with a self-diagnosed psychological disorder, he's embarking on his most fraught journey yet: into the depths of his own mind.On a warm, breezy February day in 2000, Jeb Corliss strapped on a parachute and stepped to the edge of a 310-foot sandstone cliff in South Africa.To Corliss’s left, the Umgeni River poured green and clear off the cliff to become Howick Falls, a gargantuan shaft of...…BASE-jumping pioneer Jeb Corliss is one of the original madmen, a fiend for the extreme who has miraculously survived multiple crash landings in a sport that rarely allows second chances. Now, at 44, with a self-diagnosed psychological disorder, he's embarking on his most fraught journey yet: into the depths of his own mind.On a warm, breezy February day in 2000, Jeb Corliss strapped on a parachute and stepped to the edge of a 310-foot sandstone cliff in South Africa.To Corliss’s left, the Umgeni River poured green and clear off the cliff to become Howick Falls, a gargantuan shaft of...WW…

hot day of July 26, 2018, as record 113-­degree temperatures baked Redding, California, in the northern Sacramento Valley, Eric Knapp toiled in an air-conditioned government office. After work, he planned to meet his wife and 3-year-old daughter, and some family friends, for dinner. Slender and fair-skinned with a gentle smile, Knapp is a research ecologist for the US Forest Service. He was well aware that, three days earlier, in coastal mountains west of town, a wildfire had started when a trailer got a flat tire and the metal wheel rim scraped the asphalt, sending sparks into dry...…hot day of July 26, 2018, as record 113-­degree temperatures baked Redding, California, in the northern Sacramento Valley, Eric Knapp toiled in an air-conditioned government office. After work, he planned to meet his wife and 3-year-old daughter, and some family friends, for dinner. Slender and fair-skinned with a gentle smile, Knapp is a research ecologist for the US Forest Service. He was well aware that, three days earlier, in coastal mountains west of town, a wildfire had started when a trailer got a flat tire and the metal wheel rim scraped the asphalt, sending sparks into dry...WW…