# Weekly Tech Digest
A record of **weekly tech content** worth sharing, published every **Friday**.
This magazine is **[open source](https://github.com/ruanyf/weekly)** — contributions are welcome via [submission](https://github.com/ruanyf/weekly/issues).
We also provide a **[“Who’s Hiring”](https://github.com/ruanyf/weekly/issues/8003)** service for posting programmer job opportunities.
For collaboration, please [email](http://www.ruanyifeng.com/cdn-cgi/l/email-protection).
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## Cover Story
*Hong Kong’s newly completed **Water Sports and Recreation Precinct** in Wan Chai* — its first **railing-free** promenade along Victoria Harbour. Visitors can step directly down to the seawater. ([source](https://www.hfc.org.hk/tc/hss/water-sports-and-recreation-precinct-wan-chai))
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## This Week’s Headline
**Europe’s 6 GHz Spectrum Allocation**
[Read more](https://www.lightreading.com/wifi/mobile-operators-beat-wi-fi-for-upper-6ghz-in-europe)
Europe will **split** the 6 GHz band:
- **Lower frequencies** → WiFi
- **Higher frequencies** → Mobile communications
### How it compares:
- **USA:** All 6 GHz → WiFi
- **China:** All 6 GHz → Mobile
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## Understanding the 6 GHz Decision
### Background:
1. **Early WiFi**: Operated on 2.4 GHz → crowded & unstable.
2. **Then came 5 GHz**: Less interference at first, but now congested in dense cities.
3. **Emergence of 6 GHz**: Previously unused — now a candidate for high-speed WiFi.
### Advantages of 6 GHz for WiFi:
- **Reduced congestion**
- Shorter wavelength → **poor wall penetration** → less interference from neighbors.
- **Greater bandwidth** → higher speeds for devices like VR headsets.
### Why mobile wants 6 GHz:
- Serves **larger populations simultaneously**
- Higher **frequency utilization efficiency**
- **Greater public benefit** than private WiFi
### China’s position:
- **Reserve all 6 GHz for mobile**
- Enthusiasts import overseas routers & 6 GHz-capable devices (e.g. [Apple devices](https://support.apple.com/zh-cn/102285)).
**Opinion:** Adding a high-speed band for WiFi would meet bandwidth demand, encourage device upgrades, and stimulate consumer spending.
China has allocated **6425–7125 MHz** for mobile; **5925–6425 MHz** remains undecided ([Baidu Baike](https://baike.baidu.com/item/6GHz%E9%A2%91%E6%AE%B5/63143263)).
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## Technology Updates
### 1. [Voyager 1: One Light Day Away](https://www.iflscience.com/on-november-13-2026-voyager-will-reach-one-full-light-day-away-from-earth-81432)
- Launched: **Sept 5, 1977**
- Date milestone: **Nov 13, 2026**
- Distance: **25.9 billion km** = light in 1 day
- Signals will take **>24 hrs** to reach Earth.
Will take:
- **300 years** to reach Oort Cloud
- **30,000 years** to exit it
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### 2. [Austria’s Animal-Shaped Transmission Towers](https://www.goodgoodgood.co/articles/austrian-power-giants-power-line-animals)
- **Nine designs** → one for each federal state
- Completed: **Stork**, **Deer**
- Aim: Make power towers **public art** to reduce local objections.
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### 3. [AI Makeup in Google Meet](https://www.xda-developers.com/google-meet-makeup/)
- **12 styles** available
- Preview & apply **virtual cosmetics** during meetings
- Beauty filters may become **standard** in video conferencing
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### 4. [Kodak Keychain Camera](https://newatlas.com/photography/kodak-charmera-fun-camera-keychain/)
- **Weight**: 30 g
- Features: viewfinder, LCD, Type‑C, flash, microSD
- Resolution: 1440 × 1440 px (JPEG)
Price: **$30** — currently **out of stock** ([Kodak official site](https://www.kodak.retopro.co/zh-hans/products/kodak-charmera-br-keychain-digital-camera-blind-box))
---
## Articles to Read
1. [Chinese AI Models Are Paper Tigers](https://www.gleech.org/paper) — Critical perspective; author claims models are weaker than public perception.
2. [WhatsApp Reverts to WebView on Windows](https://www.windowslatest.com/2025/11/12/meta-just-killed-native-whatsapp-on-windows-11-now-it-opens-webview-uses-1gb-ram-all-the-time/) — Performance & RAM usage woes.
3. [AI in Coding Interviews](https://mp.weixin.qq.com/s/roURrNNBJ2J5ZqdFuU1tkA) — Asking candidates to use AI to implement features.
4. [Run AI Models Locally](https://decrypt.co/348129/running-your-own-local-open-source-ai-model-easy-heres-how) — Tools: [LM Studio](https://lmstudio.ai/), [Ollama](https://ollama.com/).
5. [We Work Inside Zed](https://zed.dev/blog/zed-is-our-office) — Code, chat, collaborate inside **Zed editor**.
6. [Signs You’re an Intermediate Developer](https://dawranliou.com/blog/intermediate-dev/) — 10‑year reflection on skill benchmarks.
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## Tools
1. [LibrePods](https://github.com/kavishdevar/librepods) — Use AirPods on non‑Apple devices.
2. [IDEmacs](https://codeberg.org/IDEmacs/IDEmacs) — Emacs configured like VS Code.
3. [Kratos](https://github.com/ory/kratos) — Identity authentication server, alternative to Auth0/Okta.
4. [Biu](https://github.com/wood3n/biu)
5. [Enjoy Git](https://enjoygit.com/) — Chinese-language Git GUI for Windows.
6. [Readdig](https://github.com/readdig/readdig) — RSS & Podcast web player.
7. [Tiny SVG](https://github.com/hehehai/tiny-svg) — SVG compression tool with [demo](https://tiny-svg.actnow.dev/).
8. [fssh](https://github.com/Mister-leo/fssh) — Apple laptop SSH key fingerprint auth.
9. [CrossDesk](https://www.crossdesk.cn/) — Open-source remote desktop, cross-platform.
10. [Git PR AI](https://github.com/leochiu-a/git-pr-ai) — CLI tool + JIRA integration + AI assistance.
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## AI-related Tools
1. [Antigravity](https://antigravity.google) — Google IDE for AI programming.
2. [Code Wiki](https://codewiki.google/) — AI-generated documentation for codebases.
3. [Open CoreUI](https://github.com/xxnuo/open-coreui) — Rust-based Open WebUI rewrite.
4. [Continuous Claude](https://github.com/AnandChowdhary/continuous-claude) — CLI tool for iterative Claude runs.
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## Resources
1. [Randomness Test Guide](https://random.tastemaker.design/) — Learn statistical tests for RNGs.
2. [Mathematical Foundations of RL](https://github.com/MathFoundationRL/Book-Mathematical-Foundation-of-Reinforcement-Learning) — Open-source textbook.
3. [Learn You Some Erlang](https://learnyousomeerlang.com/content) — Beginner-friendly Erlang guide.
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## Images
### AI in Newsprint
Accidental AI conversation published in a Pakistani newspaper.
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### Peru’s Ancient Holes
5,000+ man‑made holes possibly used for storage in Inca marketplaces.
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## Digest
### The World’s First App Store
- **Japan, 1980s**
- Vending machine sold **software on floppy disks**
- Problem: Small hard drive capacity → slow dial-up downloads
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## Opinions
1. **Robotaxi package delivery** — [Elon Musk](https://stratechery.com/2025/robotaxis-and-suburbia/)
2. **Bank scam apps** — [Google](https://www.engadget.com/apps/google-will-allow-experienced-users-to-sideload-unverified-android-apps-130000130.html)
3. **Small dependencies may vanish** — [Simon Willison](https://simonwillison.net/2025/Nov/17/the-fate-of-small-open-source/)
4. **Gene therapy business model** — [Goldman Sachs](https://www.cnbc.com/2018/04/11/goldman-asks-is-curing-patients-a-sustainable-business-model.html)
5. **Robot traffic surpasses humans online** — [Decrypt](https://decrypt.co/348837/dead-internet-theory-gains-traction-ai-content-surges-online)
---
## Looking Back
- [An Internet Without Links](https://www.ruanyifeng.com/blog/2024/11/weekly-issue-327.html) (#327)
- [Best Choice for a Workspace Secondary Screen](https://www.ruanyifeng.com/blog/2023/11/weekly-issue-277.html) (#277)
- [Facebook's Employee Onboarding Education](https://www.ruanyifeng.com/blog/2022/10/weekly-issue-227.html) (#227)
- [iPad's True Purpose](https://www.ruanyifeng.com/blog/2021/09/weekly-issue-177.html) (#177)
(End)
