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Why did humans take so long to invent swords? How do swordfish use their swords? Is a swordfish bigger than my whole family? Find out on this episode of species.

Bibliography: https://docs.google.com/document/d/1zyGukCFXL-CWQKHbDOUnswGq52Hyp4Cbt4WngHQ2wZY/edit?usp=sharing

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Episode description

Swordfish

Episode description