166 years ago today, on May 6, 1859 (April 4, 1859 in the lunar calendar), the outstanding German scientist Humboldt passed away in Berlin. On May 6, 1859, the outstanding German scientist Alexander von Humboldt (1769-1859) died in Berlin. Humboldt was the founder of modern natural geography and one of the founders of modern climatology, geology, geophysics, plant geography and ecology. He devoted his life to the cause of science and left a large number of books. Humboldt's main works include "Universe" in 5 volumes,"Central Africa" in 3 volumes, and "Travel in the Tropical Regions of the New World" in 30 volumes. In memory of this great scientist, the German Academy of Sciences established the Humboldt Foundation in 1860.