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Particles of Thought
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How Fossils Form and How to Find Them | Kirk Johnson

15 min•10 december 2025

Fossilization isn’t luck - it’s geology. Paleobotanist Kirk Johnson explains how fossils only form in certain conditions, the tricks to finding them, and why one fossil leaf can lead to thousands more. 

For more, check out the extended interviewwith Kirk Johnson.

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Why Dark Matter Matters
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How Many Leaves Are on a Tree? | Kirk Johnson
•2 min
The Air You Breathe Is Bacteria Poop | Peter Girguis
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The Fish That Could Walk | Sean B. Carrol
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How Close Can You Safely Get to a Black Hole? | Janna Levin
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A New Law of Nature? | Robert Hazen & Michael Wong
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AI Is Coming for Blue Collar Jobs | Hany Farid
•2 min
What Species Can We De-Extinct? | Beth Shapiro
•2 min
Were Dinosaurs Able to Sing? | Erich Jarvis
•1 min
Space-Time Expansion, Explained | Adam Riess
•2 min

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