What pushed John Muir to become the pioneering environmentalist and founder of the Sierra Club? 1867: A sawmill is running at full speed with a terrible noise when suddenly, workers run to rescue a man on the ground. He has seriously injured his eyes. John Muir is twenty-nine years old, and it is likely that he may remain blind. But miraculously, after months of an almost mystical convalescence, he regains his sight. This episode convinces him he's going to leave everything behind and embrace hi ...