A personal magazine by Jens 67 stories 54 episodes
Hi, I'm Jens. Here you'll find 54 episodes of Cold-Knowledge Blind Box, 7 tech notes, and 38 hands-on manuals.
Cold-Knowledge Blind BoxEpisode 54
From the 1880 New York corner that blew up, to Brazil burning coffee, the collapse of the International Coffee Agreement, the 1975 black frost and the record rallies of recent years, a look at where coffee futures came from and some of their quirks.
One piece of little-known history or business per episode, explained.
View allCold-Knowledge Blind BoxEpisode 53
Tickets often don't make money. Airlines survive on miles, ancillary revenue, and treating seats as inventory.
Cold-Knowledge Blind BoxEpisode 52
Worst case, you go deliver food? After a day of runs in Melbourne, once you do the math you might not even afford a bubble tea.
Cold-Knowledge Blind BoxEpisode 51
The railroads were real, and so was the bubble. In 1873, Americans bought the future at an inflated price.
Cold-Knowledge Blind BoxEpisode 50
Diamonds became forever not because of geology, but because of a marketing campaign that ran for a century.
Cold-Knowledge Blind BoxEpisode 49
The World Cup is more than a tournament. It sews nations, money and TV commercials onto the same ball.
Cold-Knowledge Blind BoxEpisode 48
Shares worth €10 billion went missing for more than a decade. How did a Hermès heir end up handing over the keys to the safe?
The hard part of multi-agent work is the handoff. Get the shortest path running, and make sure it still works next time.
New material goes into one folder only. Anything I want to take out gets pulled from the show's directory.
A character profile is not a product. Until it can produce a manuscript you can take away, Gangqun is still a rehearsal, however busy it gets.
Remember style by blogger. You can borrow moves, but not the whole skeleton of a person.
Tracing the path of Anthropic and Dario Amodei, and how Claude turned its revenue into an industry event in two years.
How futures work, from pricing and leverage to forced liquidation, and why they are both clever and dangerous.
ManualsAI
The Dify 1.0 plugin system: remote debugging, Endpoints, reverse invocation, and real-world use cases for SSH, gateways, databases, RAG, agent strategies and MCP.
ManualsSelf-hosting
Using Nginx Proxy Manager to assign domain names to Docker ports, so you don't have to hand-write yet another layer of Nginx.
ManualsAccounts
Apple IDs from the mainland can use only a limited set of services. This guide walks through registering a non-mainland account step by step.
ManualsWebsites
What Docusaurus is, what it can do, and how I tinkered with it as a documentation site.
ManualsGoing global & finance
What to bring to open an HSBC Hong Kong account, which branch to visit, and how to book a relationship manager.
ManualsTools
An index page of development tools I use for personal projects.
