Don't Panic Geocast

By John Leeman and Shannon Dulin

John Leeman and Shannon Dulin discuss geoscience and technology weekly for your enjoyment! Features include guests, fun paper Friday selections, product reviews, and banter about recent developments. ... more

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FAQs about Don't Panic Geocast:

How many episodes does Don't Panic Geocast have?

The podcast currently has 424 episodes available.

Don't Panic Geocast episodes:

November 07, 2025Episode 422 - "Melissa"
We're still here - it has just been a very difficult time, but this week we're talking about Hurricane Melissa and Halloween Candy!
Hurricane Melissa
Video Inside the Hurricane
Fun Paper Friday
Trick or Treat! Maybe it should be Treat or Toy? Find out in this week's Fun Paper!
Schwartz, Marlene B., Eunice Y. Chen, and Kelly D. Brownell. "Trick, treat, or toy: children are just as likely to choose toys as candy on Halloween." Journal of nutrition education and behavior 35.4 (2003): 207-209.
Contact us:
Show
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John Leeman
www.johnrleeman.com
@geo_leeman
Shannon Dulin
@ShannonDulin
...more
47min
September 19, 2025Episode 421 - "Come work for you"
This week, we chat about our GEARS workshop that recently wrapped up, how it has evolved, and how it went!
GEARS Workshop
Fun Paper Friday
Hejnol, Andreas, and Mark Q. Martindale. "The mouth, the anus, and the blastopore—open questions about questionable openings." Animal Evolution: Genomes, Fossils, and Trees (2009): 33-40.
Contact us:
Show
Support us on Patreon!
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@dontpanicgeo
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John Leeman
www.johnrleeman.com
@geo_leeman
Shannon Dulin
@ShannonDulin
...more
1h 7min
September 06, 2025Episode 420 - "Tourist Destination" Kamchatka Earthquake
This week we are back and discussing the recent large earthquake in Russia!
Fun Paper Friday
Is that viral video of a fault rupture form a security camera real? This paper checks it out.
Kearse, Jesse, and Yoshihiro Kaneko. "Curved Fault Slip Captured by CCTV Video During the 2025 M w 7.7 Myanmar Earthquake." The Seismic Record 5.3 (2025): 281-288.
Contact us:
Show
Support us on Patreon!
www.dontpanicgeocast.com
@dontpanicgeo
[email protected]
John Leeman
www.johnrleeman.com
@geo_leeman
Shannon Dulin
@ShannonDulin
...more
47min
August 08, 2025Episode 419 - "Diamonds Everywhere" A States
We're hitting the open road — geologically speaking. This episode kicks off our new state-by-state series covering the most fascinating, scenic, or just plain weird geologic stops in the U.S. We’re going alphabetically (because of course we are), starting with Alabama, Alaska, and Arkansas. Some sites we've visited, others are firmly on our dream list, but every pick is guaranteed to bring a bit of science to your next adventure.
Alabama
Cheaha Mountain
Cathedral Caverns
Alaska
Wrangell-St. Elias National Park
Mendenhall Glacier
Arkansas
Crater of Diamonds State Park
Blanchard Springs Caverns
Fun Paper Friday
Frost, Mungo, et al. "Diamond precipitation dynamics from hydrocarbons at icy planet interior conditions." Nature astronomy 8.2 (2024): 174-181.
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Support us on Patreon!
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John Leeman
www.johnrleeman.com
@geo_leeman
Shannon Dulin
@ShannonDulin
...more
49min
August 01, 2025Episode 418 - "I like the crystal habit"
What makes a mineral a favorite? In this fun and down-to-earth episode, John and Shannon swap stories about the minerals they love most — and why. Along the way, they unpack cool crystal habits, formation environments, fieldwork memories, and the aesthetic appeal of minerals from museum specimens to muddy boots.
Shannon shares her appreciation for:
Hematite – With its metallic luster and planetary significance.
Goethite – A subtle but important iron oxide-hydroxide.
Smithsonite – Beautiful colors and a fascinating history in ore geology.
John counters with:
Ulexite – “TV rock,” with fiber-optic properties that never fail to wow.
Uraninite – A dense, radioactive reminder of geologic power and energy.
Tourmaline – A colorful, complex favorite of mineral collectors and scientists alike.
Fun Paper Friday
James, C. W., et al. "A nanosecond-duration radio pulse originating from the defunct Relay 2 satellite." The Astrophysical Journal Letters 987.1 (2025): L16.
Contact us:
Show
Support us on Patreon!
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@dontpanicgeo
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John Leeman
www.johnrleeman.com
@geo_leeman
Shannon Dulin
@ShannonDulin
...more
51min
July 11, 2025Episode 417 - "Who are you?"
We're back from summer break - Shannon taught field camp, John travelled for work and got hailed on, and more!
John’s Hail Storm
Fun Paper Friday
How does modern AI stack up against a cognition test designed for humans?
Dayan, Roy, Benjamin Uliel, and Gal Koplewitz. "Age against the machine—susceptibility of large language models to cognitive impairment: cross sectional analysis." bmj 387 (2024).
Contact us:
Show
Support us on Patreon!
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@dontpanicgeo
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John Leeman
www.johnrleeman.com
@geo_leeman
Shannon Dulin
@ShannonDulin
...more
1h 5min
May 16, 2025Episode 416 - "Life is a Physics Exam"
This week we talk about how we power our instruments in the field and all of the weird and wonderful ways they fail. Including getting turned into charcoal by lightning!
Fun Paper Friday
Why does ketchup splatter? Find out!
Arstechnica Article
Cuttle, Callum, and Christopher W. MacMinn. "Dynamics of compression-driven gas-liquid displacement in a capillary tube." Physical Review Letters 130.11 (2023): 114001.
Contact us:
Show
Support us on Patreon!
www.dontpanicgeocast.com
@dontpanicgeo
[email protected]
John Leeman
www.johnrleeman.com
@geo_leeman
Shannon Dulin
@ShannonDulin
...more
55min
April 25, 2025Episode 415 - "Fiat 500 Volcanic Bomb"
This week we talk hail, Vesuvius, volcanic bombs, and vitrified brains.
Scandone, Roberto, Lisetta Giacomelli, and Mauro Rosi. "Death, Survival and Damage during the 79 AD Eruption of Vesuvius which destroyed Pompeii and Herculaneum." J. Res. Didact. Geogr 2 (2019): 5-30.
Fun Paper Friday
An amazing new finding shows that brains were vitrified or turned to glass during the nearly 2000 year old eruption of Vesuvius.
Giordano, Guido, et al. "Unique formation of organic glass from a human brain in the Vesuvius eruption of 79 CE." Scientific Reports 15.1 (2025): 5955.
Mt Vesuvius
Plinian
Contact us:
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John Leeman
www.johnrleeman.com
@geo_leeman
Shannon Dulin
@ShannonDulin
...more
49min
April 18, 2025Episode 414 - "Closed Because of Landslide"
Shannon's class took a trip to study catestrophic sedimentation... and they found it! John switched back to a Mac after 5 years. Join us for these and other exciting updates!
Fun Paper Friday
Find out how alcohol and an eye puffer machine cominbed with magnets can teach us about where our motor skills reside in the brain.
Johansson, Fredrik, et al. "Alcohol impairs learning and timing of conditioned eyeblink responses." Brain Research 1854 (2025): 149545.
Contact us:
Show
Support us on Patreon!
www.dontpanicgeocast.com
@dontpanicgeo
[email protected]
John Leeman
www.johnrleeman.com
@geo_leeman
Shannon Dulin
@ShannonDulin
...more
1h 6min
April 04, 2025Episode 413 - "Waterfalls I Have Loved"
Turner Falls, Oklahoma
A rare waterfall that grows outward due to travertine deposition instead of eroding backward.
Formed by spring-fed Honey Creek flowing through Ordovician limestone, creating massive travertine deposits.
Pe'ePe'e Falls, Hawai'i (Big Island)
~80 ft falls in downtown Hilo, part of the Wailuku River flowing between Mauna Kea and Mauna Loa.
Carved into 10,000-year-old lava flows with subsequent flows creating the Boiling Pots — vertical and horizontal lava tubes.
Extremely dangerous, especially after storms — known as the deadliest water in Hawai'i.
Cataratas do Iguaçu, Brazil/Argentina
Largest waterfall system in the world, spanning the Argentina-Brazil border.
Name means "Big Water" in Guarani.
Upstream from the Itaipu Dam, which generates most of Paraguay’s electricity.
Itaipu — the 3rd largest hydroelectric plant globally and 2nd in power output.
Bonus Waterfalls Mentioned:
Cascata delle Marmore, Italy – Ancient Roman-engineered waterfall.
Natural Falls - West Siloam Springs, OK
Devil’s Kettle, Minnesota – Mysterious waterfall where water seems to disappear underground.
Fun Paper Friday
What can spacecraft learn from cats?
Zhang, Li, et al. "Analysis of Cushioned Landing Strategies of Cats Based on Posture Estimation." Biomimetics 9.11 (2024): 691.
Contact us:
Show
Support us on Patreon!
www.dontpanicgeocast.com
@dontpanicgeo
[email protected]
John Leeman
www.johnrleeman.com
@geo_leeman
Shannon Dulin
@ShannonDulin
...more
58min

FAQs about Don't Panic Geocast:

How many episodes does Don't Panic Geocast have?

The podcast currently has 424 episodes available.

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