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Particles of Thought

Particles of Thought

The Fish That Could Walk | Sean B. Carrol

Apr 15, 2026 · 2m

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How did animals first make the giant step from water to land? Evolutionary biologist Sean B. Carroll explains how the discovery of Tiktaalik—a fossil with both fish and limb-like features—revealed a key moment in evolution. For more, check out the extended interview with Sean B. Carroll. Learn more about NOVA and subscribe to our YouTube channel.