Arjan Boltjes

Bioinformatics@Princess Maxima Center for pediatric oncology, Utrecht, The Netherlands
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PhD at the Erasmus MC University Medical Center, Rotterdam
MSc in (Medical) Biology & MSc in Medicine




Indie music/arts

Veg(etari)anism
Sustainability
& whatnot

Toots in English and Dutch
He/him/his
No , no boost. Sometimes I add it myself as a reply.

335.42 ppm at birth.

Arjan Boltjestinyspheresof
2025-11-01
Arjan Boltjes boosted:

@ascentale @kimu @sam @bikenite Oh wait! I just grabbed a jersey to head out for a ride today and it’s very ‘Day of the Dead’ so I guess that counts, yeah? ⚰️ 💀

Printed fabric with skull and coffin
Arjan Boltjes boosted:
Bike Ottawabikeottawa
2025-10-30

Ontario government handcuffs cities, forcing them to prioritize cars over people’s lives.

Bill 60 provision XXI.1 effectively bans any new bike lane construction that would result in a reduction of lanes (read car lanes).

Voice your opinion against Bill 60. Call the Premier now: 647-0612-3673!

Snapshot of Part XII.1 of Ontario Bill 60 prohibiting a so-called reduction of lanes (read car lanes) in order to build bicycle lanes among other purposes.
Arjan Boltjes boosted:
Eelco Mulder :mastodon: 🇪🇺voorstad@mastodon.nl
2025-10-30

Maar weer eens in de pen geklommen. Het blijft moeilijk om digitaal souverein te blijven anders.

@Trouw

#trouw #rss #openstandaarden #bigtech

Brief aan Trouw over Google Discover en RSS:

"Zo volgt u Trouw via Google Discover', maar geen woord hierbij over open standaarden of afhankelijkheid van BigTech en de US.

Waarom helpt Trouw niet om lezers via RSS feeds Trouw te volgen (https://www.trouw.nl/rss/feeds) ? Bigtech vrij, overal te gebruiken en volledig open. Maak ons niet nóg afhankelijker!
Arjan Boltjes boosted:
2025-10-29

I own a miniature "netbook computer", the best selling type of computer from 2009 to 2011 (I believe) that's been unused for 8 years. Unlike the last generation of netbooks, with larger screens and normal sized keyboards, my Eee-PC 900A is a real 1st gen netbook: the keyboard is the right size for touch-typing toddlers and the 8GB flash is, like, small. It has a 32bit CPU; Bookworm is the final #Debian release supporting it. It now runs the latest Firefox ESR. Slow, but it works.
#netbook

a photo of an Asus Eee-PC 900A, a small A5 sized laptop computer with an 8.9" screen and a miniature keyboard.:  ,hi
Arjan Boltjes boosted:
StauBotStauBot
2025-10-29

Viele 🚗 🚚 🚗 treffen sich gerade auf der A113: Schönefeld -> Neukölln, zwischen 1.4 km hinter AS Johannisthaler Chaussee und 0.2 km vor AD Neukölln und blockieren die .

Heute protestieren sie vielleicht gegen . In deutschen Großstädten sind 40-50 % der kürzer als 5 km. In diesem Entfernungsbereich ist das das schnellste . Da bleibt man als lieber im Bett. (Quelle: )


umweltbundesamt.de/umwelttipps

Arjan Boltjes boosted:
2025-10-29

A random thought. Are share bookcases a form of mutual aid? You give away books that you don't need, and other take what they like.

Often people put other stuff in there. I found a bag for 500 1 pound coins, which I use to protect my books in my backpack from getting crushed by my other stuff.

The down side of this share bookcases is that (christian) religious organizations flood it with their propaganda. I take it on my myself to remove this and put it where it belongs, the old paper bin.

No Gods, No Masters

Arjan Boltjes boosted:
Phil (ascentale)ascentale@sfba.social
2025-10-25

And our last question of the week:

Q8. Show us a photo from something cycle-related from the past week! It doesn't have to be anything special at all.

If you'd like to, share one and tell us about it!

#BikeNiteQ #BikeNite #BikeTooter #Cycling #MastoBikes cc @bikenite

Arjan Boltjestinyspheresof
2025-10-25

@ascentale @bikenite

I posted two pics on my Pixelfed account earlier today: instapix.org/p/tinyspheresof/8

As the description says, these were taken from a ferry close to Rotterdam. Me and a friend spent 5.5+ hours on our bikes, enjoying a day off; no rain, bit of sun, decent tailwind on the way back, good company, 150+km.

Arjan Boltjes boosted:
Jon Roach, Duke of YorkFourT4@mastodonapp.uk
2025-10-25

@ascentale A8. I printed this light mount in soft squidgy TPU rather than more brittle PLA and it seems to have had a good week.

Since then I have printed a tether from TPU re-usable cable ties because I don't know how long it'll last. See Q3!

Happy to have found a model for a mount compatible both with my light and my saddle bag.

#BikeNite

Is bike saddle with saddlebag underneath. Rear light is mounted on thin strip of black plastic that is sandwiched between two pieces of attachment of seat bag to saddle.
Arjan Boltjes boosted:
2025-10-25

@saltbaygull @ascentale @plactagonic @bikenite yes that last part - on my ride back from my shoot today there were folks with signs for cars saying "Honk if you hate ICE" or similar and i rang my bell in support :)

Arjan Boltjes boosted:
2025-10-25

@ascentale @plactagonic @bikenite #BikeNite A1: posting from Alameda, CA
There’s a few things that make me love bikes. The self-sufficiency of being able to do much of my own maintenance and repairs is one, the feeling of connection to community is another. I got to the estuary shuttle today just as it went on break, so I detoured up over the bridge, which took me past the coast guard island protest. Being on my bike gave me a great position to shout encouragement and thanks to the protestors.

Arjan Boltjes boosted:
Phil (ascentale)ascentale@sfba.social
2025-10-25

@tregeagle asks:

I found a couple of fantastic old pictures from an 1890 bicycle race in my town.

Q4. Does anyone else have any historical bicycle related pictures or stories from their hometowns?

#BikeNiteQ #BikeNite #BikeTooter #Cycling #MastoBikes cc @bikenite

A crowd of cyclists in Broken Hill from over a century ago
Arjan Boltjes boosted:
2025-10-25

@ascentale @edd @bikenite A3: There are many hills on this side of Nagoya, but I only use riding cleats for distances over about 10km. For me at least, they help on longer rides by a small reduction in effort that adds up over time. On grades that steep, cleats might help a *little*, but at the cost of some quick thinking if you slow to a stop while attempting a climb with maybe a passenger on board. There are 51-tooth cassettes now, you'd probably be better off doing the drive train
#bikeNite

Arjan Boltjes boosted:
2025-10-25

@ascentale @edd @bikenite A3. Having tried with/without clips, it's only marginally better, and there's a HUGE downside, which is you have to wear clonky bike shoes into the grocery store and not kill yourself when tripping because they are not made for walking. Unless you go mountain pedal clips and special shoes. And it's not going to help. What I would do is change your front chainring to the smallest one possible on your bicycle.

Arjan Boltjes boosted:
Phil (ascentale)ascentale@sfba.social
2025-10-25

@edd asks:

I recently moved to a place with lots of 8-12% grade hills and bring my kids and groceries around by bike frequently which is... rough.

Q3. Beyond ditching the kids or changing the drivetrain to, would getting clips actually help with climbs for upstroke pulling? Will I still fit in my pants when the back quads catch up with the front?

#BikeNiteQ #BikeNite #BikeTooter #Cycling #MastoBikes cc @bikenite

Arjan Boltjestinyspheresof
2025-10-25

@MartyCormack @jfparis @ascentale @lnlyisol @bikenite
While riding my roadbike I have that feeling frequently, too, but instead of stopping I lift the wheel while riding, bouncing it on the road, feeling whether the pressure is still ok. Saves me from stopping.

Arjan Boltjes boosted:
Tjeerd Royaardsroyaards@newsie.social
2025-10-25
Cartoon waarop de rechtsstaat (verbeeld als een Griekse tempel) en de grondwet (verbeeld als een document) te zien zijn. Zij zitten, angstig kijkend, in een achtbaankarretje dat de vorm heeft van een groot rood potlood op de helling naar boven, vlak voordat de baan steil omlaag gaat en de achtbaanrit begint. Naast de achtbaan staat een bord met de tekst 'Verkiezingen' en 'Pas op: geen veiligheidsbeugels aanwezig'
Arjan Boltjes boosted:
🌹Roos Vonk ✅RoosVonk
2025-10-25

Geen beleid voeren om klimaatdoelen te halen, en de boetes die je dan krijgt betalen met het geld dat bedoeld is om de klimaatdoelen te halen.
Kan allemaal in Nederland, blijkbaar. trouw.nl/duurzaamheid-economie

Arjan Boltjes boosted:
2025-10-25

Dit weekend was weer één van onze klimtrainingen, waar een paar dozijn nieuwe activisten getraind werden hoe ze veilig de boom in kunnen gaan (en een paar oude garde voor wie het wel eens tijd werd 😉, je weet wie je bent).

Natuurlijk gaan jullie massaal op 29 okt stemmen op partijen die voor behoud van Amelisweerd zijn, waardoor het nieuwe kabinet de verbreding van de A27 door de shredder haalt 🚮. Maar mocht het nodig zijn, dan zijn wij er klaar voor.

#kiesamelisweerd #a27 #amelisweerd

Fotos van bos, klimspullen en klimmer

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