Young Alexander von Humboldt's pockets are always full of treasures from the forest: stones, insects, plants, and fossils. In the second half of the nineteenth century, he grows up to become a science-adventurer and climate genius. His expeditions take him all over the world and lead to many new discoveries. The Great Minds series introduces young children to the greatest scientists of all time. First up: Alexander von Humboldt, the father of the climate movement. For researchers ages 9 years and up.