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Mystery Mounds

Just what in the heck is buried underneath Hood Canal? When scientists discovered two dome-shaped mounds 100 feet high and 1,000 feet wide, guesses ranged from glacier build-up to gas pockets to alien graves. Turns out, the cause is probably underwater landslides of sedimentary build-up, which isn't nearly as exciting. Still hoping the landslides were caused by aliens. [Seattle PI]