While driving down an East Texas country road I spotted this scene. The autumn trees and the late afternoon sun made these golden bales of hay shine just a little bit more. Fortunately I had my camera with me. (c) James Q. Eddy Jr.

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What teeth enamel tells us about ancient human diets

NPR | By Nathan Rott

Published June 5, 2026 at 3:19 PM CDT

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The enamel on our teeth is the hardest tissue on the human body. A new study looks at the nanoscale structure of enamel from teeth dating as far back as 18 million years ago to see how it's changed.

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Nathan Rott

Nathan Rott is a correspondent on NPR's National Desk, where he focuses on environment issues and the American West.