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site iconVictor Kropp Modify

A software engineer in Munich, Germany.
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PGP Keys in DNS

2026-11-12 02:31:52

TIL that it has been possible to publish GPG key in DNS since many years. I don’t use GPG encryption often, but I do have a key, and a link to it has been displayed on my homepage for several years.

Considering that updating DNS is a matter of editing a single file, I added my key there without hesitation. Just in case.

Book Review: Millions, Billions, Zillions

2026-11-11 15:11:46

We are surrounded by numbers, which are often hard to make sense of. “Millions, Billions, Zillions” from Brian W. Kernighan helps to navigate through huge numbers and estimate them. (Yes, that Kernighan from K&R, the co-author of “The C Programming Language” and famous {} bracing style in C-style programming languages.)

The book navigates big numbers and confusion between millions and billions, various units and sometimes erroneous or over-precise conversions between them, dimensions and relations between length, area, and volume. It touches various biases, broken graphs, and other ways to lie with statistics. And finally provides useful tips to do math quickly and make educated guesses.

It is overall a great overview and makes one pay more attention to the numbers others say. And I learned a thing or two from it too.

Little’s Law

It says that at any point in time, the amount of work in a system equals its arrival rate multiplied by the time each item spends moving through it. In other words what comes in, goes out and we can estimate the number of items at any given equal stage as proportional.

The Rule of 72

It is a simplified formula (Years to double = 72 / Expected rate of return) used to estimate the number of years required to double invested money at a given annual rate of return. Alternatively, it can compute the annual rate of compounded return from an investment, given how many years it will take to double the investment.

However, at moments the book reads more like a collection of fun facts.

It is also formatted with old-school technologies, such as groff. Which may have impressed me ten or twenty years ago, but nowadays there are much better ways to publish a book.

★★★☆☆ Short and useful.

Public Toilets

2026-11-07 05:16:51

I strongly believe that there should be free public toilets everywhere. And cities, governments, and other official bodies must maintain them in good condition. Because people can’t avoid or postpone the urgent need, and it’s better to provide them with a comfort of dedicated space, rather than see someone watering a tree near the road.

Well, it seems Norway just went a step further and built public toilets so cool that they are worth mentioning on their tourist site as places worth visiting regardless of your immediate needs. And I can’t agree more, as some of them are examples of great architecture and others are built in such spectacular places that you want to stop there anyway.

Added to my travel to-do list.

App Defaults

2026-11-05 03:27:46

Three years since original App Defaults lists have been shared by many people around the internet, some started revisiting them. I wrote one in 2023, and updated it in early 2025.

I opened them today and realized that literally nothing has changed since then. I discovered some new apps after the first round, which I now use regularly, such as NetNewsWire RSS reader.

Here’s my (almost unchanged) list
📨 Mail Client: Mail.app
📮 Mail Server: Migadu
📝 Notes: Apple Notes
✅ To-Do: Apple Reminders
🟦 Photo Management: iCloud Photos & Google Photos (also want to finally setup Immich on my homelab)
📆 Calendar: Google Calendar via Calendar.app
📁 Cloud File Storage: Google Drive & iCloud
📖 RSS: NetNewsWire
🙍🏻‍♂️ Contacts: Google Contacts
🌐 Browser: Safari (personal) & Google Chrome (work)
💬 Chat: Telegram, WhatsApp & Slack
🔖 Bookmarks: Linkding ✨
📑 Read It Later: Safari Reading List
📜 Word Processing: Markdown, Google Docs
📈 Spreadsheets: Google Sheets
📊 Presentations: Keynote, Google Slides
🛒 Shopping Lists: –
🍴 Meal Planning: my wife
💰 Budgeting and Personal Finance: personal custom app ✨
📰 News: Süddeutsche Zeitung
🎵 Music: Spotify
🎤 Podcasts: Apple Podcasts
🔐 Password Management: 1Password
💻 Terminal: Ghostty

It doesn’t mean that I haven’t tried any new app since then, they are just more specialized apps. And, more personal.

And, of course, apps like ChatGPT or Claude have also become indispensable parts of daily workflows.

Lists

2026-11-04 05:05:24

I like lists and keep many of them on my homepage. I don’t trust much external services and don’t want to have half a dozen accounts to track

I regret not starting tracking all these things earlier.

And the reason I write it now is that I updated my books page with tons of book covers and fancy stacks. You should have your own favorite lists too!

Daylight Saving Time and Leap Seconds

2026-11-03 01:22:14

I rant about Daylight Saving Time in April this year already. All the points from that post are still valid. And there’s another one, surfaced in the latest Apple Watch update, when the watch may start showing the wrong time after the change. My wife experienced this bug herself, bad that I didn’t record the bug on video.

Well, there is also some good news about time. Leap seconds are now obsolete. Unlike with DST, people were able to talk to each other and agreed on the plan. Probably, because these leap seconds were only noticeable for distributed technical systems. But my hope that one day we’ll get rid of DST is reinvigorated.