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 <a href="https://www.wgbh.org/podcasts/particles-of-thought/extended-interview-fossil-hunting-sinkholes-and-paleobotany-with-kirk-johnson">extended interview</a> with Kirk Johnson.Learn more about <a href="https://www.pbs.org/wgbh/nova/">NOVA</a> and subscribe to our <a href="https://www.youtube.com/channel/UCjHz5SVHeMT0AViCYZvsGDA">YouTube </a>channel.

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.

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 <a href="https://www.wgbh.org/podcasts/particles-of-thought/extended-interview-fossil-hunting-sinkholes-and-paleobotany-with-kirk-johnson" rel="noopener noreferrer">extended interview</a> with Kirk Johnson.Learn more about <a href="https://www.pbs.org/wgbh/nova/" rel="noopener noreferrer">NOVA</a> and subscribe to our <a href="https://www.youtube.com/channel/UCjHz5SVHeMT0AViCYZvsGDA" rel="noopener noreferrer">YouTube </a>channel.&nbsp;

Why Tropical Trees Don’t Have Rings | Kirk Johnson

Particles of Thought from the producers of NOVA unleashes the universe's biggest questions through the lens of astrophysicist Hakeem Oluseyi and the world's most brilliant scientific minds. Should we resurrect extinct species? Are we blind to a fundamental force of nature? What secrets do ancient fossils reveal about humanity's destiny? Across 10 mind-bending episodes, each conversation dives deep into the discoveries that shatter assumptions, spark wonder, and completely transform how you understand reality.  Learn more about <a href="https://www.pbs.org/wgbh/nova/">NOVA</a> and subscribe to our <a href="https://www.youtube.com/channel/UCjHz5SVHeMT0AViCYZvsGDA">YouTube </a>channel.

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Particles of Thought from the producers of NOVA unleashes the universe's biggest questions through the lens of astrophysicist Hakeem Oluseyi and the world's most brilliant scientific minds. Should we resurrect extinct species? Are we blind to a fundamental force of nature? What secrets do ancient fossils reveal about humanity's destiny? Across 10 mind-bending episodes, each conversation dives deep into the discoveries that shatter assumptions, spark wonder, and completely transform how you understand reality. Learn more about NOVA and subscribe to our YouTube channel.

Particles of Thought from the producers of NOVA unleashes the universe's biggest questions through the lens of astrophysicist Hakeem Oluseyi and the world's most brilliant scientific minds. Should we resurrect extinct species? Are we blind to a fundamental force of nature? What secrets do ancient fossils reveal about humanity's destiny? Across 10 mind-bending episodes, each conversation dives deep into the discoveries that shatter assumptions, spark wonder, and completely transform how you understand reality.&nbsp; Learn more about <a href="https://www.pbs.org/wgbh/nova/" rel="noopener noreferrer">NOVA</a> and subscribe to our <a href="https://www.youtube.com/channel/UCjHz5SVHeMT0AViCYZvsGDA" rel="noopener noreferrer">YouTube </a>channel.&nbsp;

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Why Tropical Trees Don’t Have Rings | Kirk Johnson

Why Tropical Trees Don’t Have Rings | Kirk Johnson

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