Podcast: Snakes, 'Vocal Fry,' and the 'Thermal Grill' Illusion

Is "vocal fry" creeping into U.S. speech? How does the "Thermal Grill" illusion work? And have humans and snakes influenced each other's evolution? Science's Online News Editor David Grimm chats about these stories and more with Science's Kerry Klein.

(Listen to the full Science podcast and more podcasts.)

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