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Particles of Thought: Mind of a Fossil Hunter

1hr 37m 18s

What do fossilized leaves, an asteroid, and Florida sinkholes have in common? Dr. Kirk Johnson is Sant Director at the Smithsonian Institution, National Museum of Natural History, and has the answers. Kirk oversees one of the largest natural history collections on the planet – and he’s spent his career digging into the story of life on Earth across millions (and billions) of years.

Aired: 08/17/25
National Corporate funding for NOVA is provided by and . Major funding for NOVA is provided by the NOVA Science Trust, the , and PBS viewers.
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Dive into how Earth’s weirdest microbes could help us spot extraterrestrial life.
Find out why deadly flash floods are on the rise and how we can protect ourselves from them.
Explore mysterious 9,000-year-old Stone Age megastructures found in the Arabian Desert.
What is speech, really? Neuroscientist Erich Jarvis explores the science behind how we speak.
Your brain does all kinds of strange things. Neuroscientist Heather Berlin explains how it works.
NASA’s Perseverance rover may have found the clearest signs of ancient life on Mars yet.
Has science been missing a fundamental law of nature for centuries?
Clinical algorithms are meant to guide doctors toward better care – but do they?
Black holes aren’t just cosmic monsters — they’re simply misunderstood.