Particles of Thought Astrophysicist Hakeem Oluseyi and the world's most brilliant minds tackle the universe's biggest questions that will completely transform how you understand reality on Particles of Thought. Author: GBH Language: en Genres: Astronomy, Chemistry, Science Contact email: Get it Feed URL: Get it iTunes ID: Get it Trailer: Get all podcast data

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Why Tropical Trees Don’t Have Rings | Kirk Johnson
Wednesday, 28 January, 2026

Growth rings on trees can measure time, allowing scientists to date things from the deep past. But, paleobotantist Dr. Kirk Johnson explains why, in the tropics, some trees have no rings.For more, check out the extended interview with Kirk Johnson.Learn more about NOVA and subscribe to our YouTube channel. 

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