John Leeman and Shannon Dulin
Don't Panic Geocast
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. Shannon is a field geologist who tolerates technology and John is a self-proclaimed nerd that tolerates geologists.
Author
John Leeman and Shannon Dulin
Category
Podcast website
Latest episode
Jun 26, 2026
Where to listen?
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Episodes
EPISODE 331 - "GUESS AGAIN DUMMY" RYAN MAY 20.05.2022 1:33:19
This week Dr. Ryan May joins us to talk about life as a scientific software developer and his career path from radars to radiosondes and more!
Episode 330 - "Blamo" 14.05.2022 1:05:07
This week we talk about fracture of toughness of materials or how resistant they are to cracking. Fun Paper Friday Morrill, Kathleen, et al. "Ancestry-inclusive dog genomics challenges popular breed stereotypes." Science 376.6592 (2022): eabk0639. Contact us: Show Support us on Patreon! www.dontpanicgeocast.com SWUNG Slack @dontpanicgeo show@dontpanicgeocast.com John Leeman www.johnrleeman.com @ge...
Episode 329 - "Granite Annulus" 07.05.2022 1:03:19
Hardness, toughness, and brittleness are all unique, but related quantities. In this week's show we explore how they each relate to the atomic structure of the rocks and what they mean for us as geologists. Fun Paper Friday Can the ways flamingos pick a mate help us discover new drugs? Sánchez-Rodríguez, Aminael, et al. "From flamingo dance to (desirable) drug discovery: a nature-inspired approach...
Episode 328 - "Bouma" 23.04.2022 56:23
Bouma Sequence Lowe Sequence Fun Paper Friday Nikolić, Hrvoje. "Would Bohr be born if Bohm were born before Born?." American Journal of Physics 76.2 (2008): 143-146. Contact us: Show Support us on Patreon! www.dontpanicgeocast.com SWUNG Slack @dontpanicgeo show@dontpanicgeocast.com John Leeman www.johnrleeman.com @geo_leeman Shannon Dulin @ShannonDulin
Episode 327 - "Delta Tesseract" 15.04.2022 50:20
What happens when rivers meet oceans? All kinds of fun sedimentary processes that build deltas. Learn more this week along with a discussion of one man's favorite boulders. Fun Paper Friday Beaty, Chester B. "Great big boulders I have known." Geology 17.4 (1989): 349-352. Contact us: Show Support us on Patreon! www.dontpanicgeocast.com SWUNG Slack @dontpanicgeo show@dontpanicgeocast.com John Leema...
Episode 326 - "The Pinky Raise" 09.04.2022 46:12
This week it's all about conglomerates. How do these sedimentary trash cans form and how can we classify them? Fun Paper Friday Turns out it may be difficult to estimate parasite population in poop, but that didn't stop this team! Krauth, Stefanie J., et al. "An in-depth analysis of a piece of s*@t: distribution of Schistosoma mansoni and hookworm eggs in human stool." PLoS neglected tropical dise...
Episode 325 - "It turns to mud" 01.04.2022 55:40
Last week Shannon was out in the field taking samples in the area of the Colorado River. This week we find out what she was doing and the history of that region. Fun Paper Friday We have policies on making your data available to journal readers, but are they effective? Stodden, Victoria, Jennifer Seiler, and Zhaokun Ma. "An empirical analysis of journal policy effectiveness for computational repro...
Episode 324 - "Nanoknots" 26.03.2022 43:16
This week it's all about hot spots and Hawaii! Loihi Emperor Seamount Chain HUGO Fun Paper Friday Does removing something take more brain power than adding something? Adams, Gabrielle S., et al. "People systematically overlook subtractive changes." Nature 592.7853 (2021): 258-261. Contact us: Show Support us on Patreon! www.dontpanicgeocast.com SWUNG Slack @dontpanicgeo show@dontpanicgeocast.com J...
Episode 323 - "Bug light for nerds" 19.03.2022 48:33
What would we be doing in an alternate universe? We explore careers we almost took and how they relate to things we talk about all the time. Fun Paper Friday Electron Band Structure In Germanium, My Ass Contact us: Show Support us on Patreon! www.dontpanicgeocast.com SWUNG Slack @dontpanicgeo show@dontpanicgeocast.com John Leeman www.johnrleeman.com @geo_leeman Shannon Dulin @ShannonDulin
Episode 322 - "TeX Makes it Beautiful" 11.03.2022 59:34
LaTeX is a beautiful way to make documents, especially when they have lots of equations, tables, and more. This week we dive into how you too can talk TeX. Download MikTeX Fun Paper Friday Matsui, Takafumi, et al. "The manufacture and origin of the Tutankhamen meteoritic iron dagger." Meteoritics & Planetary Science (2022). ## Contact us: Show Support us on Patreon! www.dontpanicgeocast.com SW...
Episode 321 - "Big Peas" 05.03.2022 45:55
John and Shannon are tired of the wintery mix weather they've been getting, but at least now we understand what makes it! We also introduce the term "heated fellowship" and talk about if packs of wolves should be introduced to reduce road kill incidents. Fun Paper Friday Are wolves the solution to a deer problem? Raynor, Jennifer L., Corbett A. Grainger, and Dominic P. Parker. "Wolves make roadway...
Episode 320 - "Hunga Tonga" 18.02.2022 43:23
The Hunga Tonga eruption is one of the largest eruptions observed with modern equipment. This week we'll dig into what happened, how it was observed, and what we think is next for the island chain. Fun Paper Friday In line with the show (for once!) we look at shock waves on Mars... or lack thereof. Fernando, Benjamin, et al. "Questions to Heaven." Astronomy & Geophysics 62.LA-UR-21-31668 (2021...
Episode 319 - "Ions in Solution" 12.02.2022 45:32
This week it's all about chemistry, not something we say often! We chat chemical weathering and exactly what all those ions mean. Fun Paper Friday Leibring, Katharina. "Names of companion animals: Rovers in the onomasticon?." 25th International Congress of Onomastic Sciences, Glasgow 25-29 Aug, 2014. Vol. 5. University of Glasgow, 2016. Contact us: Show Support us on Patreon! www.dontpanicgeocast....
Episode 318 - "Sandstones are Forever" 05.02.2022 51:52
Weathering is what breaks the Earth down so it can be recycled, this week we dive into the mechanical methods of weathering the surface. Fun Paper Friday What feedbacks can penguin poo have on glaciers? Wang, Peiyan, et al. "Combined effects of glacial retreat and penguin activity on soil greenhouse gas fluxes on South Georgia, sub-Antarctica." Science of The Total Environment 718 (2020): 135255....
Episode 317 - "Is your tinfoil hat the same as mine?" 29.01.2022 58:33
There are lots of rumored precursors to earthquakes - everything from dogs acting strange to flashes of light in the sky. This week we take a look at a few of these and discuss how possible or impossible they may be. Flashbulb Memory Effect Earthquake Lights Animal Behavior Temperature Changes Gas Emissions Electromagnetic Changes Fun Paper Friday What is hip? When will it be hip again? Will Shann...
Episode 316 - "A centimeter is good enough" 15.01.2022 52:23
This week we dive into differential GPS and WAAS - how we can tell exactly where we are on the planet. WAAS Differential GPS Sparkfun Facet Fun Paper Friday What can we learn from a glowing jellyfish brain? Turns out, quite a bit! Phys.org article Weissbourd, Brandon, et al. "A genetically tractable jellyfish model for systems and evolutionary neuroscience." Cell 184.24 (2021): 5854-5868. Contact...
Episode 315 - "Tombstones" 07.01.2022 50:09
Glaciers are huge, weird, and complex systems. This week we talk about some weird glacial terminology and we jump the frog with this fun paper. Moulin Serac Weertman Tombstone Jökulhlaup Fun Paper Friday Astley, Henry C., et al. "Chasing maximal performance: a cautionary tale from the celebrated jumping frogs of Calaveras County." Journal of Experimental Biology 216.21 (2013): 3947-3953. Contact u...
Episode 314 - "We Did Pretty Good" 01.01.2022 1:06:51
How did you do on your 2021 resolutions? What are you going to do in 2022? John More smaller, allowed breaks Focus and completion of tasks Hit the Gym Get an IFR rating Be less reactive when appropriate Shannon say NO even more! Make a priority of staying within my boundaries (70/15/15) publish the rest of my dissertation (2 articles) make my webpage(s) and keep them updated Fun Paper Friday Marlo...
Episode 313 - "Starts with Dyson" 24.12.2021 47:14
Dyson Sphere Space Mirrors Nuke Mars Fun Paper Friday Did you get your beauty sleep? If not, others can probably tell! Axelsson, John, et al. "Beauty sleep: experimental study on the perceived health and attractiveness of sleep deprived people." Bmj 341 (2010). Contact us: Show Support us on Patreon! www.dontpanicgeocast.com SWUNG Slack @dontpanicgeo show@dontpanicgeocast.com John Leeman www.johnr...
Episode 312 - "Atmospheric Deodorant" 10.12.2021 48:51
This week John and Shannon talk about ways we could use engineering to save or destroy the planet. Stratospheric Injection Ocean Fertilization Increased Weathering Fun Paper Friday When it comes to doing dumb things - are men more likley to participate than women? Lendrem, Ben Alexander Daniel, et al. "The Darwin Awards: sex differences in idiotic behaviour." Bmj 349 (2014). Contact us: Show Suppo...
Episode 311 - "You know the answer once you know the answer" 04.12.2021 45:55
This week learn how to make strat columns based on the magnetic direction of rocks! It's time to learn about magnetostratigraphy. Magnetostratigraphy Fun Paper Friday How did the human hand evolve? These authors make no bones about it. Press Release Williams-Hatala, Erin Marie, et al. "The manual pressures of stone tool behaviors and their implications for the evolution of the human hand." Journal...
Episode 310 - "Paul Bunyan's Potty" 27.11.2021 51:54
Canyonlands National Park is a beautiful and large display of sedimentary processes, impacts, and more. Learn about the features of this park and how they got there in this week's show! ASU Virtual Field Trip Paul Bunyan's Potty Fun Paper Friday What if your dog could call you? Would they? Once scientist dared to ask the question. Hirskyj-Douglas, Ilyena, Roosa Piitulainen, and Andrés Lucero. "For...
Episode 309 - "Assume a Spherical Chicken" 20.11.2021 50:30
A recent publication tried to determine if strange folded glasses found in the Atacama Desert formed by an extraterrestrial process. Turns out, mineraology and microscopy hold the key! Schultz, Peter H., et al. "Widespread glasses generated by cometary fireballs during the late Pleistocene in the Atacama Desert, Chile." Geology (2021). Fun Paper Friday Can chicken de-feathering be used as a wind s...
Episode 308 - "Clay is kind of a trash can" Cements 12.11.2021 44:33
This week John and Shannon discuss sedimentary rocks and what holds them together. Cements can be made of many different materials and don't change the name of the rock! Fun Paper Friday What can we learn from ducks drafting while swimming? Yuan, Zhi-Ming, et al. "Wave-riding and wave-passing by ducklings in formation swimming." Journal of Fluid Mechanics 928 (2021). Contact us: Show Support us on...
Episode 307 - "Up, Up, and Away" 05.11.2021 37:16
Weather balloons are one of the few ways to really get in-situ atmospheric measurements. John was over in Norman, OK working on a new balloon borne instrument. We talk about what all is involved in a launch! Launch Video Fun Papery Friday What do shark intestines have to do with the inventor of the AC motor? Find out! Leigh, Samantha C., et al. "Shark spiral intestines may operate as Tesla valves....
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