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