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The Problem With Bitcoin

Everybody Wins

Dec. 9, 2024
Some thoughts on the long term viability of Bitcoin's rising value.

A few days ago the value of a single Bitcoin briefly surpassed $100K, a milestone that seemed unimaginable just some years ago. I wonder how durable the ever growing love for Bitcoin is. Let's have a closer look at the mechanisms underpinning the world's most famous cryptocurrency.

Write your own words

Against AI for writing

Nov. 11, 2024
Why not to use AI for writing - a blog post on the underestimated long term costs of AI tools for human creativity.

Two years ago ChatGPT launched, it popularised AI as tool to create things. Large language models generate text based on prompts, outputting words that are hard to distinguish from being written by a person. The short term benefits are clear, but I suspect many people underestimate the long term costs.

Go Viral on X

32K views in two days

Nov. 10, 2024
Learn how to go viral on X using simple logic in creating engaging posts.

Earlier this week one of my posts on the social network X went viral and attracted 32K views in two days. With no major presence on Elon Musk's platform, and no paid advertising, gaining that kind of attention is something special. Let me explain how this happened.

Marathon

Running my first full marathon

Oct. 20, 2024
Read the story of how it feels to complete your first marathon.

Last Sunday I completed my first full marathon, covering a distance of 42KM in and around Amsterdam. An idea that started in a bar with some beers and concluded with a finish in the Olympic Stadium. What a journey, what an experience, well worthy of a blog post.

I see dead people

Augmenting old photos in virtual reality

Sep. 10, 2024
This may be Apple Vision Pro's killer feature, enabling you to see dead people: augmenting old photos into lifelike representations.

Imagine seeing your dead family members - not just on a picture, but lifelike and in three dimensions! You can almost touch them. It hits you differently, I can assure you. I'm still in awe: I just saw my dead grandfather, lifelike and for the first time ever in three dimensions! This may be Apple Vision Pro's killer feature, if you allow me the pun, please hear me out.

No, I Won't Build That!

Better Thinking, Better Work

Mar. 5, 2024
Discover how saying 'no' can lead to more innovative and meaningful work in this blog post:

If you're an accomplished developer (as in: you've actually created things in the past), you may recognise this scenario: people reaching out to you, asking you to build something specific. "Can you build X for me?" A fellow technician once urged me to refuse more often: be proud of the things you don't do! Let me explain in this post.

Hello, stranger

Talking to random people

Oct. 13, 2023

While enjoying my fresh wok lunch in Amsterdam, I noticed something odd: other folks coming in for something to eat ignored the person standing at the counter, preferring to order through a digital kiosk. The crazy thing about this? They are just centimetres apart!

MUSE in Carré

Rock meets elegance

Oct. 23, 2022
MUSE's legendary rock fused with Amsterdam's Royal Theatre Carré for an unforgettable, electrifying experience - read about my experience!

Last Sunday I experienced a breathtaking fusion of legendary rock band MUSE and Amsterdam's iconic Royal Theatre Carré. The band's electrifying sound in the theatre's sophisticated atmosphere proved to be a recipe for an unforgettable night.

Computer says no

How today is ruled by Artificial Intelligence

Sep. 11, 2022
The weather app indicating rain caused an empty bike lane this morning, making me wonder about the power we put into these things.

This morning I enjoyed my bike ride on a nearly empty bicycle lane, picture perfect rays of sunlight illuminated the dew above the fields around me. Where were all the other cyclists? I suspect it has something to do with popular weather apps. It strikes me how great the control of computers on people's lives already is.

CAPTCHA Alternative

Protect your forms in a user friendly way

July 30, 2022
If you're looking for a user-friendly alternative for CAPTCHA's you should check this post out where I outline how I protect web forms against malicious actors and spammers.

Chances are that you've encountered a CAPTCHA in the wild: they protect web forms by asking you to type over weirdly rendered characters or by asking you to select photos containing a particular thing. Why are they used and is there a user friendly alternative?

Snake '97 High Scores

Game inspired art by Zena Van den Block

Apr. 18, 2022
Happily accepting the invitation to attend an exhibition of Snake 97 art works in Antwerp. This was totally WOW!

Last week I received a very kind invitation from a Belgian artist, to attend her art exhibition in Antwerp. The work on display involved the Snake '97 game that I have created. Uttering to find the right words and thrilled with excitement, I happily accepted the invitation!

Inspiration from a child

Experience the world like a kid

Sep. 30, 2021
Explore the world together with your kids and reap the rewards of adventure and fun!

Together with my kids I love to explore the world that we think we know as adults. A kid's perspective inspires and surprises! No need to travel half the world for an adventure: Fly planes, catch bad guys, solve problems, build and break stuff - (re)discover the adventure right at your doorstep!

Wearing two watches

Both a mechanical and a smartwatch

Feb. 28, 2021
Why you should wear two watches, don't choose between a mechanical watch and a smartwatch!

For the past weeks I have been wearing two watches, and boy this is a thing! I love my mechanical watch, but I needed the modern connectivity of a smartwatch. I couldn't choose between them, so I decided to wear both. It's not as bad as you think, let me share some thoughts on my experience.

The value of notifications

How to setup your smartphone to save time

Feb. 22, 2021
It's easy to dismiss your phone's notifications as something that disturbs you, but if you take the time to set them up correctly, notifications can actually save you time!

It's easy to dismiss your phone's notifications as something that disturbs you, something annoying. But if you take the time to set them up correctly, notifications can actually save you time in the long run. Gain more focus by taking control over your online connection to the world. Read along for some tips!

Influencing purchase behaviour

Applying behavioural sciences principles to the purchase decision process

July 31, 2020
For my work I am continuously looking into scientific sources to improve e-commerce performance, conversion rates and online revenue. Use this useful report to apply behavioural sciences principles to your advantage.

This week I stumbled upon a brilliant report on how people make their purchase decision. For my work on the online food order app I am continuously looking into scientific sources to improve performance, conversion and online revenue. This report by Google discusses six biases influencing decision making. It's worth reading their full report, let me explain why.

The day I sold my car

Looking back at my years with Smart Roadster

Feb. 13, 2020
This week I sold my car, I now no longer own one. I look back at my years of owning a sports car, if you're looking for a reason to buy one you should check this out.

This week I sold my car, I now no longer own one. For me, this is something of a change as over the years I owned various sports cars that were like a hobby to me. My discovery of cycling and the birth of my son changed this. But if you're looking for a reason to buy a sports car, read along!

Realtime human pose recognition through computer vision

Using TensorFlow and PoseNet on a video feed

Dec. 1, 2019
For an exciting new project I have been experimenting with TensorFlow, enabling realtime pose detection using PoseNet.

For an exciting new project I have been experimenting with computer vision using TensorFlow. I wanted to achieve realtime human pose detection to drive interactive video projections and games. Time to dive into the world of machine learning, tensors and computer vision!

Visiting an international hackers conference

OWASP Global AppSec Amsterdam

Sep. 27, 2019
This month I attended Global AppSec Amsterdam, an international conference for hackers and security specialists. Read along for some of the highlights.

This month I was lucky enough to attend Global AppSec Amsterdam, an international conference for hackers and security specialists. There were presentations from former intelligence agents, bounty hunters, academics and software vendors. I learned about some of the newest hacking techniques, met with interesting people and played some cool retro games. Read along for more.

Do amazing things with a focused mind

Taking an ice bath and swimming in the Amstel river

Dec. 6, 2018
Read about my experience during the workshop I got as a birth day present involving the Wim Hof Method.

Just when the temperature was a low 2° Celsius, I jumped in the Amstel river! While it was nearly freezing outside I went for a swim, just moments after I've taken an ice bath! This post is about the incredible birthday present I got, a workshop involving the Wim Hof Method.

Rescuing files from a broken harddisk

Make backups to be safe rather than sorry!

Oct. 16, 2018
Yesterday I helped a young woman with her broken computer containing precious photos, could I safe them?

Yesterday a young woman brought me her laptop, it didn't start anymore and it only showed an error message. It turned out to be a broken harddisk. It startled her when I told her that all data on the disk was lost. She told me it contained precious photos of her pregnancy and young child. What could I do?

Helping people with free software

Installing Debian GNU/Linux on an old laptop

July 20, 2018
This week I helped a man with repairing and reinstalling his computer with Debian GNU/Linux.

This week a man brought his laptop to the community centre where I help people with computer problems as volunteer. The old laptop wouldn't start anymore and had to be reinstalled. Instead of Windows, I installed a free operating system. I think it is important to tell you how and why I did it.

Enjoy a festival without alcohol

Alcohol-free beer at Rock Werchter

July 10, 2018
This year I didn't drink alcohol during Rock Werchter, leading to interesting observations during the music festival.

Last weekend me and my brother went to Rock Werchter, a multi-day, music festival in Belgium. Over 140 thousand visitors enjoy world famous artists like Pearl Jam, Nick Cave, Artic Monkeys, Noel Gallagher, The Killers and the Queens of the Stone Age. This year I didn't drink alcohol during the festival, leading to some interesting observations...

Outside the comfort zone: amateur acting

Wearing an heart rate monitor during my debut performance

Apr. 18, 2018
This month I strapped myself with sensors during a little experiment outside my comfort zone: I debuted as amateur actor!

This month I made my debut as amateur actor. I am no Hollywood star, nor do I envy to become one. But I do like crazy experiments and operating outside of my comfort zone often leads to new and refreshing insights. I took part in an amateur drama play and - in the name of science and fun - strapped myself with sensors to measure what happened to my body.

Something the smartwatch will never have: patina

Wear and tear by the hands of time

Jan. 21, 2018
Patina is often neglected when comparing smartwatches with regular watches.

A good friend of mine had an issue with his Apple Watch, the digital crown lost a rubber ring causing the watch to lose its water resistance. Apple made no problem of it and offered to replace his "device". While it solved his problem, it felt painful to my watch lover's ears. It made me realise the one thing a smartwatch will never have: patina.

Lessons from a takeaway plastic bag

My ever increasing antipathy to planned obsolescence

Jan. 8, 2018
How we're tricked into repeated purchases replacing perfectly fine products just for the sake of change.

About five months ago I got some take away food from our local Asian restaurant. They packaged the food and gave me a plastic bag to carry it home. On my way home I was thinking about the bag. Although it has some nice styling printed on it, it's designed for single use only. What a waste... making me wonder: how long would it last if you would use it on a daily basis?

Commuting by bike

One week (240KM) on the VanMoof Electrified S

Dec. 2, 2017
One week on the VanMoof Electrified S E-bike testing it for commuting and comparing it to a normal bike.

For a few years now, I commute to work using a bicycle. I have lost more than 15KG since I stopped using my scooter. This week I tested a VanMoof Electrified S, an electric bike with an industrial, minimal design. Is it any good? How does it compare to a normal bike? Will an electric bike make you lazy? Read along to find out!

Climbing Mount Etna

Visiting an active volcano on Sicily, Italy

Sep. 2, 2017
Climbing Mount Etna, an active volcano on Sicily Italy.

Last week me and my wife went to Sicily for a little summer holiday. It is the largest island in the Mediterranean Sea. It is an autonomous region of Italy, along with surrounding minor islands. It's home to Europe's largest active volcano: Mount Etna. We had a chance to visit this lava spurring monstrosity and it was quite the experience.

Fietselfstedentocht 2017

Cycling the 235KM bicycle tour through Friesland

June 30, 2017
Cycling the 235KM long Fietselfstedentocht through Friesland

This month I cycled the Fietselfstedentocht, a 235KM tour through Friesland. This tour brings you through various Frisian cities throughout one of the most Northern provinces of the Netherlands. The tour was first organised in 1912 and has grown to become legendary due to its history, challenge and popularity; well worthy of a blog post!

Being a volunteer in Amsterdam-Zuidoost

Computer support in the local community center

Nov. 21, 2016
About my work as volunteer in the local community center in Amsterdam Zuidoost

After realising how lucky I am as an healthy, well educated, young man with a solid income, I wanted to do something for other people as volunteer. It just so happens to be that two years ago I received a flyer in my mailbox from the local community center: they were looking for someone with some knowledge of computers. A very interesting journey was about to begin!

Cash is king, or is it?

The wallet- and cash-less experiment

July 15, 2016
Is the time right to ditch the wallet?

Very often I see men carry a wallet filled with plastic: multiple debit and credit cards plus a bunch of loyalty programs and membership cards. Then, some even top it off with stinky paper money and sticky metal coins! It made me wonder if I can free up one pocket by ditching the wallet?

All blog posts
Mountaineering like a pro... of sorts. :-)
Mountaineering like a pro... of sorts. :-)
a Zerdax (from the 1960's, worth about €100), a Citizen (1970's ~ €80) and a Seiko (2008, €130)
a Zerdax (from the 1960's, worth about €100), a Citizen (1970's ~ €80) and a Seiko (2008, €130)
James Kettle on hacking PayPal - gaining $38,900 in bounties
James Kettle on hacking PayPal - gaining $38,900 in bounties
Lot's of folks on the street, many of them with a healthy tension in their tenure
Lot's of folks on the street, many of them with a healthy tension in their tenure
Message from Rock Werchter about alcohol-free beer
Message from Rock Werchter about alcohol-free beer
2009-2024: Bitcoin's rise in value is hard to ignore
2009-2024: Bitcoin's rise in value is hard to ignore
Compare the zoo to the
Compare the zoo to the "wildlife" you'll encounter in the city's metro. Find answers for questions like "Why do you wear sunglasses (in darkness)?", "Where are you going?", "What's in the bag?"
Remember the days that this was your average computer - note: the IBM model M keyboard... oh boy!
Remember the days that this was your average computer - note: the IBM model M keyboard... oh boy!
Usage of my iPhone and iPad, from left to right: time spent, pickups and notifications
Usage of my iPhone and iPad, from left to right: time spent, pickups and notifications
You can look just as crazy as before - without alcohol
You can look just as crazy as before - without alcohol
My Asics GT-4000 in mako blue/black, extra wide (2e)
My Asics GT-4000 in mako blue/black, extra wide (2e)
Royal Theatre Carré in Amsterdam by night
Royal Theatre Carré in Amsterdam by night
Biometric readings covering the month leading up to the performance
Biometric readings covering the month leading up to the performance
Wearing my mechanical watch because I like it
Wearing my mechanical watch because I like it
The Messy Middle model (Rennie Et Al., 2020)
The Messy Middle model (Rennie Et Al., 2020)
Keynote presentation by cyberwarfare specialist, Chris Kubecka
Keynote presentation by cyberwarfare specialist, Chris Kubecka
This photo was taken on October 6, 1983 - only my mom (in white) is still alive
This photo was taken on October 6, 1983 - only my mom (in white) is still alive
Replacement disk
Replacement disk

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