Insights from recent episode analysis
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Insights are generated by CastFox AI using publicly available data, episode content, and proprietary models.
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Estimated from 1 chart position in 1 market.
By chart position
- 🇮🇸IS · Technology#172500 to 3K
- Per-Episode Audience
Est. listeners per new episode within ~30 days
250 to 1.5K🎙 ~2x weekly·303 episodes·Last published today - Monthly Reach
Unique listeners across all episodes (30 days)
500 to 3K🇮🇸100% - Active Followers
Loyal subscribers who consistently listen
200 to 1.2K
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On the show
From 14 epsHosts
Recent guests
Recent episodes
307: From Super Soakers to Heat Engines with Dr. Lonnie Johnson
Jun 24, 2026
Unknown duration
306: Is This Finally a Real Solid State Battery? With Jorge Diaz Scheider
Jun 10, 2026
40m 26s
305: Having a Think with Dave Borlace
May 27, 2026
1h 19m 22s
304: JerryRigged Wheelchairs and More with Zack Nelson
May 13, 2026
44m 35s
303: Karl Rábago and the Internet of Electricity
Apr 29, 2026
54m 48s
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| Date | Episode | Topics | Guests | Brands | Places | Keywords | Sponsor | Length | |
|---|---|---|---|---|---|---|---|---|---|
| 6/24/26 |  307: From Super Soakers to Heat Engines with Dr. Lonnie Johnson | The inventor of the Super Soaker, Dr. Lonnie Johnson, joins Matt to talk about his most ambitious project yet: the JTEC, a heat engine with no moving parts that converts low-grade waste heat straight into electricity. They get into how it actually works, why Johnson thinks it could run far more efficiently than what we use today, and the long road from a 2003 idea to the first commercial unit. Plus how a billion-dollar water gun quietly funded a quarter-century of clean-energy research.Chapters:00:00: Intro05:06: Dr. Lonnie Johnson Interview32:36: Previous Episode FeedbackWatch on YouTube: https://www.youtube.com/watch?v=LhbPajWdgUkSupport the show directly: https://stilltbd.fm/join/Audio version of the podcast: https://stilltbd.fmYouTube version of the podcast: https://www.youtube.com/@stilltbdYouTube membership: https://www.youtube.com/channel/UC4-aWB84Bupf5hxGqrwYqLA/joinGet in touch: https://stilltbd.fm/contact/Follow us on:Mastodon - https://mastodon.social/@mattferrellBluesky - https://bsky.app/profile/mattferrell.bsky.socialUndecided with Matt Ferrell: https://www.youtube.com/@undecidedtechnology Hosted on Acast. See acast.com/privacy for more information. | — | ||||||
| 6/10/26 |  306: Is This Finally a Real Solid State Battery? With Jorge Diaz Scheider✨ | solid state batterytechnology+3 | Jorge Diaz Schneider | Ion Storage Systems | — | solid state batteryceramic-based battery+3 | — | 40m 26s | |
| 5/27/26 |  305: Having a Think with Dave Borlace✨ | renewable energyinterview+4 | Dave Borlace | Just Have a ThinkYouTube+1 | — | renewable energytransition+4 | — | 1h 19m 22s | |
| 5/13/26 |  304: JerryRigged Wheelchairs and More with Zack Nelson✨ | wheelchair manufacturingsolar DIY+3 | Zack Nelson | JerryRiggedEverythingYouTube | — | wheelchairZack Nelson+3 | — | 44m 35s | |
| 4/29/26 |  303: Karl Rábago and the Internet of Electricity✨ | internet of electricityelectrical grid+3 | Karl Rábago | Acast | — | internet of electricityelectrical grid+3 | — | 54m 48s | |
| 4/15/26 |  302: The Future of Food with Nona Yehia✨ | vertical farmingtechnology+3 | Nona Yehia | Vertical Harvest | — | vertical farmingNona Yehia+3 | — | 41m 26s | |
| 4/1/26 |  301: Talking Donuts & Batteries with Ricky Roy and Ryan Inis Hughes✨ | batteriestechnology+4 | Ricky RoyRyan Inis Hughes | Donut LabTwo Bit Da Vinci+2 | — | Donut Labbatteries+4 | — | 1h 11m 56s | |
| 3/25/26 |  300: Tasty, Solid State Donuts✨ | solid state batteriesYouTube collaboration+3 | — | Donut LabYouTube+2 | — | solid state batteriesDonut Lab+3 | — | 27m 30s | |
| 3/18/26 |  299: Making Connections with Alec Watson✨ | future techcurrent trends+3 | Alec Watson | TechnologyConnections | — | technologytrends+3 | — | 1h 01m 45s | |
| 3/11/26 |  298: Why Waiting for Better Solar Costs You More✨ | solar technologycost analysis+3 | — | YouTubeUndecided with Matt Ferrell+1 | — | solartechnology+4 | — | 23m 42s | |
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| 3/4/26 |  297: Heat Pump Comparison & Paul Braren Interview✨ | heat pumpstechnology comparison+4 | Paul Braren | TinkerTry.comUndecided with Matt Ferrell+1 | — | heat pumpcomparison+5 | — | 49m 44s | |
| 2/25/26 |  296: Flywheels! Getting All Spun Up✨ | flywheelsmechanical energy storage+3 | — | Two Bit DavinciUndecided with Matt Ferrell+1 | — | flywheelsmechanical energy storage+3 | — | 20m 39s | |
| 2/18/26 |  295: Why Aluminum Batteries?✨ | Aluminum batteriesBattery technology+3 | — | Undecided with Matt FerrellAcast+1 | — | Aluminum batteriesbattery technology+3 | — | 30m 15s | |
| 2/11/26 |  294: Heat Pump: Scams?✨ | Heat Pumps3D Printing+3 | — | YouTubeUndecided with Matt Ferrell+1 | — | Heat Pumps3D Printing+3 | — | 42m 28s | |
| 2/4/26 |  293: Sodium Battery Fade✨ | sodium batterieslithium prices+3 | — | Undecided with Matt FerrellAcast | — | sodium batterieslithium prices+3 | — | 38m 42s | |
| 1/28/26 |  292: Move Over Perovskite - There’s a New Solar Kid in Town | https://youtu.be/3fntze01h_kMatt and Sean talk about a new material we might see in solar panels, and Matt’s invasion on Hank Green.Watch the Undecided with Matt Ferrell episode, Why This Solar Breakthrough Matters More Than Perovskite https://youtu.be/F_OPrOpccJs?list=PLnTSM-ORSgi7uzySCXq8VXhodHB5B5OiQ(00:00) - - Intro & Feedback(16:23) - - Kesterite DiscussionYouTube version of the podcast: https://www.youtube.com/stilltbdpodcastGet in touch: https://undecidedmf.com/podcast-feedbackSupport the show: https://pod.fan/still-to-be-determinedFollow us on X: @stilltbdfm @byseanferrell @mattferrell or @undecidedmfUndecided with Matt Ferrell: https://www.youtube.com/undecidedmf ★ Support this podcast ★ Hosted on Acast. See acast.com/privacy for more information. | — | ||||||
| 1/21/26 |  291: CES 2026 Roundup | https://youtu.be/iSGqe9lefQIMatt and Sean talk about Matt’s CES 2026 visit, the good, the bad, the funny … including Donut Labs solid state battery.Watch the Undecided with Matt Ferrell episode, The Most Controversial Battery at CES 2026 https://youtu.be/Kt4c0o_3eyY?list=PLnTSM-ORSgi7uzySCXq8VXhodHB5B5OiQ(00:00) - - Intro & Feedback(12:17) - - CES 2026 DiscussionYouTube version of the podcast: https://www.youtube.com/stilltbdpodcastGet in touch: https://undecidedmf.com/podcast-feedbackSupport the show: https://pod.fan/still-to-be-determinedFollow us on X: @stilltbdfm @byseanferrell @mattferrell or @undecidedmfUndecided with Matt Ferrell: https://www.youtube.com/undecidedmf ★ Support this podcast ★ Hosted on Acast. See acast.com/privacy for more information. | — | ||||||
| 1/7/26 |  290: State of Perovskite Solar Roundup | https://youtu.be/SrkuzIo1liMMatt and Sean talk about the current status of perovskite solar progress, plus your responses to our previous episodes.Watch the Undecided with Matt Ferrell episode, What Solar’s 2025 Breakthroughs Mean for 2026 https://youtu.be/FffKMMnisu4?list=PLnTSM-ORSgi7uzySCXq8VXhodHB5B5OiQ(00:00) - - Intro & Feedback(15:00) - - State of Solar DiscussionYouTube version of the podcast: https://www.youtube.com/stilltbdpodcastGet in touch: https://undecidedmf.com/podcast-feedbackSupport the show: https://pod.fan/still-to-be-determinedFollow us on X: @stilltbdfm @byseanferrell @mattferrell or @undecidedmfUndecided with Matt Ferrell: https://www.youtube.com/undecidedmf ★ Support this podcast ★ Hosted on Acast. See acast.com/privacy for more information. | — | ||||||
| 12/17/25 |  289: Salty AND Sweet? Desalination + Power Plants | https://youtu.be/PA2Wc_pxZ6YMatt and Sean talk about desalination and osmotic power production, plus your responses to our previous episodes.Watch the Undecided with Matt Ferrell episode, The Ocean's Invisible 15,000 TWh Goldmine https://youtu.be/kko09WIC6yc?list=PLnTSM-ORSgi7uzySCXq8VXhodHB5B5OiQ(00:00) - - Intro & Feedback(20:20) - - Desalination and Osmotic Power DiscussionYouTube version of the podcast: https://www.youtube.com/stilltbdpodcastGet in touch: https://undecidedmf.com/podcast-feedbackSupport the show: https://pod.fan/still-to-be-determinedFollow us on X: @stilltbdfm @byseanferrell @mattferrell or @undecidedmfUndecided with Matt Ferrell: https://www.youtube.com/undecidedmf ★ Support this podcast ★ Hosted on Acast. See acast.com/privacy for more information. | — | ||||||
| 12/10/25 |  288: Perovskite? All Right! | https://youtu.be/HjYEgF598CIMatt and Sean talk about perovskite solar panels, silver prices, and other new (old) issues.Watch the Undecided with Matt Ferrell episode, How This Perovskite Breakthrough Could Change Solar Forever https://youtu.be/8Eh9m4U7GGk?list=PLnTSM-ORSgi7uzySCXq8VXhodHB5B5OiQ(00:00) - - Intro & Feedback(22:00) - - Perovskite DiscussionYouTube version of the podcast: https://www.youtube.com/stilltbdpodcastGet in touch: https://undecidedmf.com/podcast-feedbackSupport the show: https://pod.fan/still-to-be-determinedFollow us on X: @stilltbdfm @byseanferrell @mattferrell or @undecidedmfUndecided with Matt Ferrell: https://www.youtube.com/undecidedmf ★ Support this podcast ★ Hosted on Acast. See acast.com/privacy for more information. | — | ||||||
| 12/3/25 |  287: AI’s Impact on our Electric Bills | https://youtu.be/kWC8Cylbu5AMatt and Sean talk about the impact of AI on our electric bills and more.Watch the Undecided with Matt Ferrell episode, How AI is Destroying Your Electric Bill https://youtu.be/n8m1BCzvGCA?list=PLnTSM-ORSgi7oiN-erZtwugd0muTdQXnU(00:00) - - Intro & Feedback(09:03) - - AI Costs DiscussionYouTube version of the podcast: https://www.youtube.com/stilltbdpodcastGet in touch: https://undecidedmf.com/podcast-feedbackSupport the show: https://pod.fan/still-to-be-determinedFollow us on X: @stilltbdfm @byseanferrell @mattferrell or @undecidedmfUndecided with Matt Ferrell: https://www.youtube.com/undecidedmf ★ Support this podcast ★ Hosted on Acast. See acast.com/privacy for more information. | — | ||||||
| 11/19/25 |  286: Plastic Recycling Advancements | https://youtu.be/t6Lc9WS60vAMatt and Sean talk about recycling plastic (will we ever get there?), simple home energy solutions (insulation!), and more.Watch the Undecided with Matt Ferrell episode, The Recycling Breakthrough That Doesn't Need Sorting https://youtu.be/D9Hd4KMoxds(00:00) - - Intro & Feedback(16:21) - - Plastic Recycling DiscussionYouTube version of the podcast: https://www.youtube.com/stilltbdpodcastGet in touch: https://undecidedmf.com/podcast-feedbackSupport the show: https://pod.fan/still-to-be-determinedFollow us on X: @stilltbdfm @byseanferrell @mattferrell or @undecidedmfUndecided with Matt Ferrell: https://www.youtube.com/undecidedmf ★ Support this podcast ★ Hosted on Acast. See acast.com/privacy for more information. | — | ||||||
| 11/5/25 |  285: Heat Pump It Up! Geothermal 2 Years Later | https://youtu.be/FmTo8ZkfZ68Matt and Sean talk about Matt’s geothermal heat pump experience, digging wells, and the meaning of “young.”Watch the Undecided with Matt Ferrell episode, How My Geothermal Heat Pump Really Performed (2 Years) https://youtu.be/DTb7TKJzr5g?list=PLnTSM-ORSgi7uzySCXq8VXhodHB5B5OiQ(00:00) - - Intro(05:22) - - Feedback(17:33) - - 2 Years of Geothermal DiscussionYouTube version of the podcast: https://www.youtube.com/stilltbdpodcastGet in touch: https://undecidedmf.com/podcast-feedbackSupport the show: https://pod.fan/still-to-be-determinedFollow us on X: @stilltbdfm @byseanferrell @mattferrell or @undecidedmfUndecided with Matt Ferrell: https://www.youtube.com/undecidedmf ★ Support this podcast ★ Hosted on Acast. See acast.com/privacy for more information. | — | ||||||
| 10/22/25 |  284: Shocking Zinc Battery News | https://youtu.be/Xx9sCiVZxJ4Matt and Sean talk about a change in what research says is good for zinc batteries, and more topics from last week's episode. Watch the Undecided with Matt Ferrell episode, The Surprising Battery Discovery No One Saw Coming https://youtu.be/GRumW9JzGbc?list=PLnTSM-ORSgi7uzySCXq8VXhodHB5B5OiQ(00:00) - - Intro & Feedback(21:31) - - Zinc Batteries DiscussionYouTube version of the podcast: https://www.youtube.com/stilltbdpodcastGet in touch: https://undecidedmf.com/podcast-feedbackSupport the show: https://pod.fan/still-to-be-determinedFollow us on X: @stilltbdfm @byseanferrell @mattferrell or @undecidedmfUndecided with Matt Ferrell: https://www.youtube.com/undecidedmf ★ Support this podcast ★ Hosted on Acast. See acast.com/privacy for more information. | — | ||||||
| 10/1/25 |  283: Sweating Solar Panels, Upgrade Woes, and More | https://youtu.be/Ay_Yr2aI9twMatt and Sean talk about increasing solar power efficiency by making the panels (ew) sweat, and more topics from last week’s episode.Watch the Undecided with Matt Ferrell episode, How This Hydrogel Gives Us 12% More Solar Efficiency https://youtu.be/yWMxM8YQcN4?list=PLnTSM-ORSgi7uzySCXq8VXhodHB5B5OiQ(00:00) - - Intro & Feedback(16:39) - - Solar Panel Hydrogel DiscussionYouTube version of the podcast: https://www.youtube.com/stilltbdpodcastGet in touch: https://undecidedmf.com/podcast-feedbackSupport the show: https://pod.fan/still-to-be-determinedFollow us on X: @stilltbdfm @byseanferrell @mattferrell or @undecidedmfUndecided with Matt Ferrell: https://www.youtube.com/undecidedmf ★ Support this podcast ★ Hosted on Acast. See acast.com/privacy for more information. | — | ||||||
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Chart Positions
1 placement across 1 market.
Chart Positions
1 placement across 1 market.