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NOVA Presents

NOVA Presents

How Many Leaves Are on a Tree? | Kirk Johnson

Apr 29, 2026 · 2m

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About this episode

Need to know how many leaves are on that tree? Paleobotanist Dr. Kirk Johnson shares the surprisingly nerdy method—because you never know when leaf math will come in handy. For more, check out the extended interview with Kirk Johnson. Learn more about NOVA and subscribe to our YouTube channel.