#ScienceHoliday
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gasmantell.bsky.social
Old #collage from a Dream Catalogue w @skot #scienceholiday #illustration #zine
November 2, 2026 at 9:41 PM
testtubegames.com
Happy(?) Election Day.

Let's all blink together.
#ScienceHoliday
ncase.me/fireflies/
Fireflies
a small simulation of small fireflies
ncase.me
November 3, 2026 at 4:25 PM
testtubegames.com
Happy Look For Circles Day.

And what is a gear, but a circle?
(...)
I've been informed that a gear is actually far more complex than that. Learn more: ciechanow.ski/gears/
#ScienceHoliday
Gears – Bartosz Ciechanowski
Interactive article explaining how mechanical gears work.
ciechanow.ski
November 2, 2026 at 7:02 PM
testtubegames.com
Happy "Worldwide Howl at the Moon Night."

If this is your first time, I suggest starting off small, by howling at a moon scaled down to the size of a single pixel.
#ScienceHoliday
www.joshworth.com/dev/pixelspa...
If the Moon Were Only 1 Pixel - A tediously accurate map of the solar system
www.joshworth.com
October 26, 2026 at 2:16 PM
testtubegames.com
It's National Mushroom Day!

So get out there and, uh, play Mycelium Empire, a really interesting game about the fungus that connects plant roots underground. Go get those nutrients, folks!
#ScienceHoliday
capra-solutions.itch.io/mycelium-emp...
Mycelium Empire by Capra Solutions
Grow a fungal empire underground — spread, mutate, and dominate every ecosystem.
capra-solutions.itch.io
October 15, 2026 at 4:51 PM
testtubegames.com
Uh, Happy International Top Spinning Day!

I actually hadn't come across this one yet from Falstad, can't believe I missed it in the list. Your very own simulated spinning top.
www.falstad.com/top/
#ScienceHoliday
Top
www.falstad.com
October 14, 2026 at 2:54 PM
testtubegames.com
Happy International Powers of Ten Day.

To celebrate, go explore a wide range of masses ->
#ScienceHoliday
testtubegames.com Andy Hall @testtubegames.com · Aug 28
In order to celebrate today's release of Agent Higgs 2...

Let's explore the universe of the very small!

We'll begin with an object of mass between 1-10 kg.
Then go down by a factor of ten each post.

And do that *32 times*!

Let's start with something very familiar... a particle physics textbook.
October 10, 2026 at 4:00 PM
testtubegames.com
It's World Octopus Day.

So you know what to do: go practice the right-tentacle-rule as you navigate electric & magnetic fields in... The Electric Shocktopus.
#ScienceHoliday
testtubegames.com/shocktopus_w...
The Electric Shocktopus
Survive this electromagnetic game, or die trying. Zoom across electric fields, twist through magnets, and use conductors to bend the world to your will. Never has the Right-Hand-Rule involved so many ...
testtubegames.com
October 8, 2026 at 6:19 PM
testtubegames.com
Happy Birthday to CERN - which turns 72 today.

To celebrate, go learn some particle physics by playing Particulars, a free game where you move subatomic particles around.
store.steampowered.com/app/259470/P...
#ScienceHoliday
Particulars on Steam
Particulars is a game with a unique combination of arcade-action and puzzle gameplay, set in the mysterious world of subatomic particles.
store.steampowered.com
September 29, 2026 at 2:22 PM
testtubegames.com
It's Fish Tank Floorshow Night.

That's right. Just a bit of time left to prepare.

For inspiration, let me take you on a journey to *show* you the *floor* of the largest *fish tank*. The ocean.
neal.fun/deep-sea/
#ScienceHoliday
Blue as if you're under the sea, with the title The Twilight Zone. Images of four sea creatures are placed around, labeled with their names: wolf eel, thick-billed murrie dive, haddock, and one who looks like a shark but we can't see their name.
September 28, 2026 at 2:01 PM
testtubegames.com
Happy Museum Day!

Go explore the Hall of Fossils at the Smithsonian. Right now. Via the power of cyberspace.
naturalhistory2.si.edu/vt3/NMNH/DT/...
#ScienceHoliday
A spiral sign display at a museum with various paleo images in the spiral. Text says Journey Through Deep Time. In the background there appears to be a large fossil skeleton.
September 26, 2026 at 1:40 PM
testtubegames.com
It's Math Storytelling Day!

So go learn about a math story - in this case, literally a video story about virus shapes, with a side-by-side interactive component where you can explore their geometry.
viruspatterns.com
#ScienceHoliday
Virus, the Beauty of the Beast
An interactive science video about viruses - and how humans have accidentally imitated them.
viruspatterns.com
September 25, 2026 at 1:58 PM
testtubegames.com
Happy World Maritime Day!

Seems like a pretty good day to make sure you understand ripples and waves. Falstad, as always, has you covered.
falstad.com/ripple/
#ScienceHoliday
Ripple of concentric teal circles emanating out from a point at the top of the image.
September 24, 2026 at 2:18 PM
testtubegames.com
It's World Car Free Day

So go learn the science about one of my top 3 favorite alternatives to cars - bicycles!
ciechanow.ski/bicycle/
#ScienceHoliday
Bicycle – Bartosz Ciechanowski
Interactive article explaining the physics of a bicycle.
ciechanow.ski
September 22, 2026 at 1:50 PM
testtubegames.com
Happy Miniature Golf Day!

Glad I didn't share this particular science game earlier - should have known there'd be this, the perfect day for it.

Go play Magnetism Mini Golf ->
universeandmore.com/magnetism-mi...
#ScienceHoliday
SImple 3 by 3 grid with minimal art style of a golf club, a hole with flag, and a path representing where the ball has rolled. The path goes straight, unless going over x's on the ground, or dots on the ground, where it turns.
September 21, 2026 at 5:36 PM
testtubegames.com
It's still Indoor Plant Week!

Since it's not specifically *houseplant* week - let's look at something else from our house: a blueberry!

We can see cells that make up the juicy bit, and colorful cells of the skin. But what's that mysterious bright purple? It was in a few spots...
#ScienceHoliday
Blueberry cross section on a cutting board next to a knife. Microscope view of a lot of transparent cells that look fairly bag-like and inflated - with some small organelles visible in some cells. Lots of small dark red cells tightly packed next to one another. The look a bit like dark sand spread in a thin layer. Similar to before, dark cells, though a bit more zoomed out, and this time there's a roughly circular patch that's just glowing magenta and purple. It's unclear why that region is different.
September 17, 2026 at 9:47 PM
testtubegames.com
National Indoor Plant Week goes on!

Today I took a close up look at my Swedish Ivy -- it's been propagating for a couple weeks, and roots are growing! Under the microscope you can see a bit of a root tip, and tons of tiny root hairs!

On the top side of a leaf, a bunch of red dots?
#ScienceHoliday
Swedish Ivy water propagating in a glass, a stem with many white roots visible poking mostly straight out from it. Microscope view of a root tip. The tip is a slightly yellower color than the rest, and a root tip is sorta visible if you know where to look. Microscope view of a root, with central vessels visible and lots of very tiny root hairs sticking off the side. Microscope view of the top of a leaf with lots of small green cells, and white veins branching across the view. There are many tiny red dots on the leaf, about the size of a cell.
September 16, 2026 at 9:17 PM
testtubegames.com
It's *still* National Indoor Plant Week - which means I'm *still* up to my planty tricks.

I cut and propagated my FIDDLE-LEAF FIG (one of my OG plants, it had gotten HUUUGE) - which meant I ended up with some leaves to look at under the 'scope.

100x, bottom side, top side
#ScienceHoliday
Circle of green with tiny cell speckles throughout and light green webbing lines stretching across. Slightly darker green than before, with white webbing lines (a few more visible than before). Throughout though are lighter dots that are medium sized.
September 15, 2026 at 1:38 PM
testtubegames.com
It is NATIONAL INDOOR PLANT WEEK.

Aaaah!

Sorry. Okay. So. You'll have to bear with me, because this is gonna be a multi-day affair.

Yesterday, our philodendron jumped off the shelf (yikes) and a leaf broke. Soo... I put it under the microscope...

40x, top side, bottom side.
#ScienceHoliday
Top of leaf. Circle of pale green in a microscope - striped a bit like jupiter honestly. Not many surface features to see aside from stripes of different shades of green and a lot of lighter colored speckles. Can see some parallel veins, and juuust make out cells if you look closely. Bottom of leaf. Circle of green under a microscope. This green is a more saturated color, we also have parallel stripes of veins along it. You can see clearly though what look like lots of little circles on the leaf - which are the stomata.
September 14, 2026 at 1:43 PM
testtubegames.com
Happy Video Games Day. That's right.

So if you want to learn some science while playing video games, do I have the thing for you!
#ScienceHoliday #NoAI
thescienceplayground.com
Website titled The Science Playground, a list of interesting links. Under the navigation menu are several thumbnails of simulations, with descriptions underneath. One appears to be about atoms, another about waves, and the third about astronomy. There's searchable filters on the side.
September 12, 2026 at 3:01 PM
testtubegames.com
Happy Blame It on the Large Hadron Collider Day!

(Hey, it's big, it can handle the blame.)
Particle Clicker feels appropriate to play today...
#ScienceHoliday
particle-clicker.web.cern.ch
Particle Clicker
An addictive incremental game that was made during the CERN Webfest 2014. It takes the player on a historic journey through modern particle physics.
particle-clicker.web.cern.ch
September 10, 2026 at 2:22 PM
testtubegames.com
Comes earlier every year...

It's: Care Bears Share your Care Day!

So go be a person who cares by exploring this really well made game about how to fix our planet.
#ScienceHoliday #noai
store.steampowered.com/app/2334990/...
Green New Deal Simulator on Steam
Achieve zero emissions and full employment in this casual card-driven game.
store.steampowered.com
September 9, 2026 at 2:02 PM
testtubegames.com
It's Star Trek Day!

Trek across the stars in your own rocket with SpaceFlight Simulator! Nice program for making rockets, and free to use on mobile.

(Found it on Risa, and have the sudden urge to share it with everyone… what fun!)
#ScienceHoliday
apps.apple.com/us/app/space...
Spaceflight Simulator App - App Store
Download Spaceflight Simulator by Spaceflight Simulator UK Ltd on the App Store. See screenshots, ratings and reviews, user tips, and more apps like Spaceflight…
apps.apple.com
September 8, 2026 at 11:18 AM
testtubegames.com
It's National Acorn Squash Day!

To celebrate, I guess eat an acorn squash? Also go explore a world that seems squashed (onto a hyperbolic plane) in the mathematically-fascinating game: HyperRogue!
#ScienceHoliday
roguetemple.com/z/hyper/
HyperRogue - About
puzzle roguelike on a hyperbolic plane
roguetemple.com
September 7, 2026 at 1:10 PM
testtubegames.com
It's both Pet Rock Day *AND* Read a Book Day!

So for your science fix today - go to your local library/bookstore and read I, Rock - one of the top two most delightful book you'll ever find about geology! By the one and only @kslivensky.bsky.social!
#ScienceHoliday
bookshop.org/p/books/i-ro...
I, Rock: A Geology Tale
“Rockhounds will delight in finding out how rocks are born” (School Library Journal, starred review) in this charmingly funny and thoroughly informative nonfiction picture book told from the perspecti...
bookshop.org
September 6, 2026 at 1:53 PM