Friedrich Wilhelm Heinrich Alexander von Humboldt (September 14, 1769 – May 6, 1859) was a Prussian geographer, naturalist and explorer, and the younger brother of the Prussian minister, philosopher and linguist Wilhelm von Humboldt (1767–1835). Humboldt's quantitative work on botanical geography laid the foundation for the field of biogeography.
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Alexander von Humboldt sought to see and understand everything. By the time he drew his self-portrait at age 45, Humboldt ...