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A sloth hangs from a tree branch at the Sloth Sanctuary and Rescue Shelter in Cahuita, Limon Province, Costa Rica, on March 10, 2023. The fur of the Costa Rican sloth can produce antibiotics that keep at bay pathogens tha could make the tropical animal sick. Now, scientists wonder whether they could apply this to humans. Max Chavarria, a researcher at the University of Costa Rica, found in the notoriously lazy mammals' fur a unique mix of insects, fungi, algae and bacteria creating a delicately balanced biome that keeps sickness away. (Photo by Ezequiel Becerra/AFP Photo)
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