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This toy boat is stuck in perfectly calm water — and you can recreate it at home. Salt water at the bottom, dyed fresh water on top, a toy boat pulled by a small weight. In plain water the boat zips across the tank. With two layers it starts fast… then almost stops. Underneath, a hidden wave forms on the boundary between the layers and follows the boat, stealing its energy. In 1904 the oceanographer Vagn Walfrid Ekman ran this exact experiment to explain why Nansen's ship Fram got stuck in the Arctic in 1893. Same physics, from a kitchen tank to the polar sea. #shorts #deadwater #science #experiment #physics #ocean #ships