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View full lesson: https://ed.ted.com/lessons/the-strange-case-of-the-cyclops-sheep-tien-nguyen

In the 1950s, a group of ranchers in Idaho were baffled when their sheep gave birth to lambs with only one eye. Mystified by these cyclops sheep, they called in scientists from the U.S. Department of Agriculture to investigate. What happened? Tien Nguyen describes how, decades later, one team of biologists stumbled upon the answer.

Lesson by Tien Nguyen, animation by Anton Bogaty.

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