After my E36 M3’s S52 engine blew from a oil pump nut failure, I did a full rebuild rather than just a refresh. I went with a set of Schrick cams and bumped the compression ratio with forged pistons. While the head was off, I also took the time to overhaul the entire cooling system and install high-flow injectors. Getting the software tune dialed in was a process, but it was necessary to make the most of the new internals the motor finally feels healthier and more responsive than it did the day it left the factory.

Do my children count? They are incredibly smart and are wonderful people.

@Eliza I'm making it right now, and it's@ManiFed!!!

However, on a more serious note, I'm a high school student, so I haven't had enough time to create something truly impressive. Nevertheless, I did build a threaded stool by myself for my grandmother. It took me about five days (mainly threading the intricate pattern). In the end, it looks beautiful, and a few of our neighbours asked where it was from and how much it cost!

I built a tool for a college project that automatically sends email and text reminders about assignment deadlines. It does more than that, though: it uses an LLM API to congratulate you when you get a good grade and to encourage you if you screwed up a quiz. Since it can access your Gradescope data, it can also infer when you tend to stay up late based on your submission timestamps and nudge you to get to bed earlier. Sometimes it’ll just drop random comments based on whatever context it finds, like titles of uploaded essays.

Morrowind mod to make the 2 best telvanni base overalls play nicely together. On the one hand, it was not so much work on my part. On the other, it made a couple 'best of' lists.

Well...

Best thing I'm working on currently is @ManiFed (and its awesome slogan "not not not not solvent")

Best theoretical thing I've built was a standardized format for explaining basic observational astronomy that's been used by a bunch of libraries and schools

Best physical thing I've ever built was a Dobsonian Telescope (including optical fabrication), just above restoring 2 centuries-old historic telescopes

The best thing I've ever made overall could change soon rapidly... I'm sure @JeromeHPowell can testify

Best thing:

• I derived some quasi-novel nuclear decay equations during a university project

  

Honorable mentions:

• In Minecraft I made a giant fractal pyramid with a dragon statue on top

  

• Using no modern technology, just the natural resources I could find in my garden and my bare hands, I made a flint-tipped spear capable of impaling an apple

  

I haven't made may noteworthy things, but I did reverse-engineer and then adapt a magic trick to suit my taste, and I think it turned out pretty well.
Simply put, it's an adaptation of "Shuffle bored", but with a few improvements (in my opinion).
For starters, Simon Aronson doesn't shuffle the deck before splitting it, which is because he requires a it to be in a specific order. I like to be able to use a borrowed deck and have any (pushy) person who wants to shuffle it do so. Which is why I have the spectator shuffle as part of the trick. After they have shuffled, I look through the cards and write down a prediction, much like the one in the video, while saying something like "you can predict so much of someone's actions from the smallest of things".
Then the trick goes on much like in the video I linked but I tend to use different themes, like "influencing a person", using it to back up a statement that fate is set in stone, or acting like I can predict how someone will shuffle.
Some of my favorite things to say are : "When you shuffle a deck, you are arranging it in an order that no one has ever and will ever again." ( of course you can use any mathematical equivalent like “If you shuffled for your entire life, you’d almost certainly never see this exact order of face‑up and face‑down cards again; the odds are on the order of one in 10^68. That’s about as unlikely as winning a big national lottery around ten times in a row.”
Or when asked how I did it "Pretty well, at least I hope so"
This comment is already too long, so if anyone wants a more detailed explanation, feel free to DM me.

My friend and i made a full treehouse in a forest we found. It was already kinda there but we added to the top structure part and designed it better. Was a fun summer activity. It overlooked a river aswell.

I've been getting back into an online game I played when I was in high school. It's a 5v5 game, and I thought I'd make it more worthwhile if I could earn money (even if play money) from playing the game. Prediction markets have been a huge thing as of late, and there didn't seem to be any betting market for my game, except maybe on streamer platforms. But, I'm no streamer nor do I plan on becoming one. So, I created a complete application for players to create markets on Manifold and have others bet on them. You can see my demo here https://cyril-rimo.pages.dev/

I wrote the Wikipedia article on Humblebragging! Another major Wikipedia accomplishment of mine is that my combined edits have been viewed over 1 million times (1,652,955 times, as of this comment)

I built the weather machine by accident.

It started as a clock in my garage. Not a good one. Just bicycle gears, a cracked barometer from a flea market, copper wire I pulled out of a dead radio. I wasn’t trying to predict the weather. I just wanted to see time move in a way that felt real, something that clicked and stretched instead of glowing on a screen.

The whole thing lived on a sheet of plywood bolted to the wall. When air pressure dropped, a brass arm sagged. When humidity went up, a violin string tightened and gave off this quiet hum. Everything outside made something inside shift or scrape or ring. After a while, I could read it without thinking too hard. Not precisely—just honestly.

Then I noticed something that didn’t make sense.

The clouds showed up after the machine changed.

At first I told myself I was imagining it. So I tested it. One dry afternoon, I nudged a tension wheel forward by a single tooth. That night it rained. The next day I adjusted it again, slowly, and a wind came through strong enough to bend the trees but not snap them. It wasn’t controlling the weather exactly. It felt more like a conversation. Like the machine was making suggestions, and the sky was listening.

I didn’t tell anyone. I just kept working on it. Swapping parts. Refining it. Learning when to touch it and when to leave it alone.

That was the hardest part, honestly. Knowing when to stop.

Years later I moved out. The garage got sold. I like to think the machine’s still there—rusted, quiet, doing nothing anyone can prove. But the neighborhood always seems to get just enough rain. Just enough sun.

And no one can ever explain why.

Over the summer I found an abandoned warehouse and turned it into an office