smarken blog

https://invidious.nerdvpn.de/watch?v=5vbl5FL-nsI

https://www.youtube.com/watch?v=5vbl5FL-nsI

1,600 Miles with this...

I spent three weeks trying to bridge Reticulum onto HF so two people could pass a real message hundreds of miles with no cell tower, no Starlink, and nobody in the middle charging a toll. The radio is a Hermes Lite 2. The hard part isn’t only the physics — U.S. amateur rules also forbid hiding the meaning of a message on these bands, so whatever goes over the air has to be legal. This is an attempt to build an open-source internet we actually own, using the sky as the hop.

Parallel Primer — the course for how the hardware, radios, and software fit together:
👉 https://buildwithparallel.com/product...

Haven — the node I use in the field:
👉 https://buildwithparallel.com/product...

CrossTalk: Reticulum Workbench https://github.com/buildwithparallel/...

Build the open-source internet with us: https://buildwithparallel.com/

🎥 NEW: Unlock MEMBERS-ONLY videos and behind-the-scenes drops 👉 / @dataslayermedia
🛠️ The exact tools and gear I trust (and actually use) 👉 https://amzn.to/44fKDv4 📡 Join the r/ModernRadio community for LoRa, Meshtastic, and off-grid tech builds 👉 / modernradio
💬 Get real-time help and connect with other builders on Discord 👉 / discord
📩 For sponsorships or business inquiries, reach out: macgyvertechnology@gmail.com 🧠 Need expert help fast? Book a 1:1 session and get unstuck today 👉 https://calendly.com/session-with-tim... AI-genereret videooversigt AI kan begå fejl, så sørg for at dobbelttjekke dens svar.

Data Slayer explores building a long-range, decentralized communication network by bridging digital data with amateur radio. Through open-source software and hardware, Data Slayer investigates how HF radio skywave propagation can connect communities across continents, bypassing traditional internet infrastructure while strictly adhering to amateur radio regulations and licensing requirements.

https://invidious.nerdvpn.de/watch?v=kS-CGkiPetQ https://www.youtube.com/watch?v=kS-CGkiPetQ

The math behind Google Maps. Sponsored by boot.dev - Click this link https://boot.dev/?promo=VERITASIUM and use our code VERITASIUM to get 25% off your first payment for boot.dev.

If you’re looking for a molecular modelling kit, try Snatoms, a kit I invented where the atoms snap together magnetically - https://ve42.co/SnatomsV

Sign up for the Veritasium newsletter for weekly science updates - https://ve42.co/Newsletter

For those curious about the path-count estimate: we estimated the non-backtracking paths NYC→SF, using a sparse spatial network model with mean degree ≈ 2.5 and characteristic length ≈ √N.

0:00 What is a ‘shortest path algorithm’? 3:30 Dijkstra’s 20 Minute Algorithm 6:30 The First Route Planner 10:31 A* Search Algorithm 12:40 Shortest Doesn’t Mean Fastest 15:08 Road Network Hierarchy 18:29 Mapping North America - Nested Dissection 25:17 How do map apps work? 28:04 Simplicity is prerequisite for reliability

Check out ‪@twoswap‬'s channel for some fantastic videos!

A big thank you to Ben Strasser and Julian Dibbelt who were incredibly gracious with their time and feedback.

Thank you to all the experts we interviewed for this video: Aaron Bernstein, Tim Roughgarden, Tomas Rokicki, Jon Kleinberg, Virginia Vassilevska Williams, Peter Sanders, and the team behind the SSSP Barrier Paper: Xinkai Shu, Ran Duan, Xiao Mao, Longhui Yin, Jiayi Mao

For more information on how you choose A's heuristic, check out Polylog's video: • The hidden beauty of the A algorithm

If you'd like more information on Minecraft's A*, check out RedLogic's video: • Minecraft’s Smartest System Is Almost Comp...

References: https://ve42.co/DijkstraRefs

https://www.facebook.com/reel/2255747055221397

This entire HF messaging station fits in the palm of my hand. 📻📱 No laptop. No tablet. No cell service. No internet. A 5-watt truSDX, Digirig and Android phone running JS8Call let me send actual free-text messages over HF — type whatever you need to say, just like a text message. Phone-based radio apps keep getting better, eliminating the need to carry a computer or tablet into the field. For this setup I’m using the incredibly compact SPOOLTENNA Ultra EFHW. The entire station — radio, battery, DigiRig, cables AND antenna — fits inside a lesterriverbushcraft utility pouch with room to spare. Five watts isn't much for HF voice, but weak-signal digital is a different story. Under the right conditions, JS8Call can exchange messages hundreds or even thousands of miles. For preparedness, my focus is NVIS — roughly 0–300 miles. That can mean a local, statewide or regional network, or reaching outside a disaster area when normal infrastructure is down. With the right band, antenna and conditions, 5 watts can get that job done. This test: 5 watts • 84 miles • Message sent • Reply received ✓ No towers. No internet. No computer. Just radio. 📡

LTT : We traveled to Falkenstein, Germany, to tour one of Hetzner’s data centers and see how their hands-on, DIY approach helps power their infrastructure at scale. From custom-built solutions to the servers themselves, we got a behind-the-scenes look at how Hetzner does things a little differently.

This is the largest freestanding wooden train trestle in the world. It's been abandoned for almost 90 years. No road reaches it. The railroad it was built for runs nowhere. And the man whose fortune created the whole impossible thing died seven years before this bridge even existed. The Goat Canyon Trestle is the most famous piece of the San Diego & Arizona Railway, the "Impossible Railroad" that John D. Spreckels personally bankrolled starting in 1906. Twelve years to build. A panic, a revolution, a world war, and roughly 18 million dollars, most of it Spreckels' own. Then 90 more years of the desert taking it back. And the bridge itself wasn't planned. It was a patch. A workaround for a tunnel that collapsed in an earthquake in 1932. The crown jewel of the Impossible Railroad is, literally, a repair. So my buddy Justin and I rode 17 miles into the Anza-Borrego desert to stand on it. This is what we found, and the full story of why it's even there, before the desert finishes what it started

https://www.facebook.com/watch?v=2326207334607902

https://www.youtube.com/watch?v=m03HqAdqgT4

Af Dr. Imran Rashid (Linkedin) Original på Linkedin

For nylig blev Metas egne interne studier gjort offentlige af whistleblowers på sitet: https://metasinternalresearch.org/ - og de efterlader ikke meget tvivl. Meta har i årevis vidst, at deres platforme kan forværre mental trivsel, især hos børn og unge, gennem øget social sammenligning, kropsutilfredshed og symptomer på angst og depression.

Det mest afslørende er måske, at Meta selv har undersøgt, hvad der sker, når brugere tager pauser fra platformene. Resultatet var tydeligt. Folk fik det bedre. Mere ro. Mindre stress. Mere nærvær.

Det her handler derfor ikke om uvidenhed eller utilsigtede bivirkninger. Meta har haft data, indsigt og tid. Alligevel er forretningsmodellen i al væsentlighed uændret, og incitamentet er stadig maksimal fastholdelse frem for trivsel.

Set fra et sundhedsfagligt perspektiv er én ting svær at komme udenom. Dette ansvar kan ikke placeres hos den enkelte bruger eller forælder. Det er strukturelt og indbygget i designet.

Derfor bliver spørgsmålet ubehageligt, men nødvendigt: Hvorfor accepterer vi, at et kommercielt system med dokumenterede negative effekter på mental sundhed i praksis regulerer sig selv? 🚸

Læs Metas egne ord. Ikke for at blive forarget, men for at forstå, hvor klart vidensgrundlaget allerede er.

👉 https://metasinternalresearch.org/

Hvad tænker I, der arbejder med børn, sundhed, forskning og regulering – hvor længe kan vi blive ved med at kalde dette et individuelt ansvar? 🌱