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9wL77 TIL: Ducks have ballistic penises and corkscrew vaginas
EgJl7 TIL: weight gain happens because fat cells become larger in both size and number, while weight loss only reduces the size of fat cells, so you end up with a larger number of fat cells than before.
78n6P TIL: In 2011, a pod of sperm whales adopted a bottlenose dolphin with a deformed spine.