Alexander von Humboldt (1769-1859) is one of the most celebrated figures of late-modern science, famous for his work in physical geography, botanical geography, and climatology, and his role as one of the first great popularizers of the sciences. His momentous accomplishments have intrigued German biographers from the Prussian era to the fall of the Berlin wall, all of whom configured and reconfigured Humboldt's life according to the sensibilities...