For math enthusiasts, here's a 3D printed 150x150 section of the Ulam Spiral!

/r/3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
Implementing my own BigInt library for CUDA
A question about The Fantastic Four: First Steps
The place to drop your theories and memes about the MCU. Spoilers are allowed but please tag them as such.
How to plot the entire complex curve?
A subreddit dedicated to sharing graphs created using the Desmos graphing calculator. Feel free to post demonstrations of interesting mathematical phenomena, questions about what is happening in a graph, or just cool things you've found while playing with the calculator. Reply to people with commands! For example, "!fp" explains what floating point arithmetic is. Try out commands at https://redd.it/1ixvsgi
Can't see how many views a product has anymore
Welcome to the unofficial Vinted subreddit. Here we discuss everything to do with buying and selling on Vinted across the world. Please have fun and be kind! For the time being, all posts need to be approved by a mod before going "live".
My little Kurisu corner

In this subreddit, you may submit posts about the Science Adventure series. This includes: * Steins;Gate and Steins;Gate 0 * Chaos;Head and Chaos;Child * Robotics;Notes and Robotics;Notes DaSH * Occultic;Nine and Anonymous;Code Please flair and spoiler tag your posts accordingly.
How are we preventing lead from contaminating our recycled glass by people that don't know they are actually throwing away crystal?
Ask away! Disclaimer: This is an anonymous forum so answers may not be correct
Difference in density between the number of primes in the Ulam spiral centered in (0, 0) and the one centered in (+Googol,+Googol)
This subreddit is for discussion of mathematics. All posts and comments should be directly related to mathematics, including topics related to the practice, profession and community of mathematics.
My grandfather's cat with strabismus likes to sleep in this basket

Pictures, videos, questions, and articles featuring/about cats.
Lonely runner conjecture and Euler's totient function
This subreddit is for discussion of mathematics. All posts and comments should be directly related to mathematics, including topics related to the practice, profession and community of mathematics.
My cat sleeps like this
Pictures, videos, questions, and articles featuring/about cats.
Even train unloading
Community-run subreddit for the game Factorio made by Wube Software.
Space Planet - Orbital Trance (Happy 303)
/r/hardtrance focuses on harder and more aggressive trance that is commonly known as "Hard Trance"! Any time period of hard trance is welcome here - and although we feel that the genre had its peak during the last 1990's, you will find newer music as well. #HardTranceRevolution
Decaying tree trunk that looks like a horse face

Pictures of things that are recognizable as other objects. For example, a picture of a cloud that happens to look like a whale sword fighting a leprechaun.
Copper(II) Glutamate

A community for chemists and those who love chemistry
How to prevent Enderman from spawning in the overworld, using only command blocks?
A place for all things about commands, command blocks and data-packs in vanilla Minecraft; to share, to question, to discuss, and more! Please read the pinned post before posting.
What fungus is this?
Spider on pumpkin leaf, 2024

For spiders that jump, they're pretty damn awesome.
How to prevent players from cloning a map with a cartographer table, using only commands?
A place for all things about commands, command blocks and data-packs in vanilla Minecraft; to share, to question, to discuss, and more! Please read the pinned post before posting.
How to summon (NOT give) a specific player head
A place for all things about commands, command blocks and data-packs in vanilla Minecraft; to share, to question, to discuss, and more! Please read the pinned post before posting.
Same type of seeds, different type of leaves

Aww, cripes. I didn't know I'd have to write a description. How many words is that so far, like a hundred? Soooo, yeah. Mildly interesting stuff. Stuff that interests you. Mildly. It's in the name, ffs.
Slug descending from a prune leaf using slime, in my garden
For anything truly interesting as fuck
Makise Kurisu | Good Smile Company X Penguin Parade

A subreddit for the discussion of figures from anime, manga, and Japanese-style media.
What killed my cat?
A place where you can ask veterinary medicine related questions and get advice from veterinary professionals.
[PC][1997-2004] 2D Kid's game with a little of Side-scrolling
This is a subreddit for finding the name of a game that you can't remember. Read the rules, post your description, and hopefully someone will be able to identify it. Be sure to help out if you think you may have an answer to someone else's post!