NATIONAL BESTSELLER * A biography of Alexander von Humboldt, the visionary German naturalist whose ideas changed the way we see the natural world--and in the process created modern environmentalism. * From the acclaimed author of Magnificent Rebels. "Vivid and exciting.... Wulf's pulsating account brings this dazzling figure back into a dazzling, much-deserved focus." -- The Boston Globe Alexander von Humboldt (1769-1859) was the most famous scientist...