For some time now, I've been thinking about the concept of interactively manipulating mathematical expressions and equations via software. Like doing some quick algebra in Notepad or similar, except there's no potential for arithmetic/algebra errors, typos, etc. ruining any results.

At the same time, I also wanted to experiment a bit with zippers from functional programming. You need some way of specifying what (sub)expression to perform operations on, and it seemed like this kind of data structure could help with that.

And so, I made AlgeZip, a small proof-of-concept of the whole general idea. Although this polished Python version was completed only a few days ago, there were various other versions before this one in different languages and with worse-quality code. Instructions for things are on GitHub; requires Python 3.12 to run.

For simplicity, I decided to use boolean expressions instead of generic numeric algebraic expre

[This is a rewritten version of a post I made on r/Kirby 8 months ago.]

One day, I came across the following passages in Elfilin's character entry on TV Tropes (final entry under "Other Heroes"):

Cosmic Motifs: According to the official guidebook, Elfilin's ears were designed to resemble the waxing and waning of the moon. This was meant to represent "having lost the quality of a single existence", that is, having separated from Fecto Forgo.

The Fog of Ages: According to the official guidebook, he barely has any memory of his time as a test subject in Lab Discovera anymore.

At the time, I wasn't able to find anything else that talked about this information. At some point, I checked out this official(? It's official enough for WiKirby.) guidebook myself. [This is the relevant page](https://m.media-amazon.com/images/I/81y

I haven't actually played Deltarune in quite a long time, but this community needs some more posts, and I'd like to do my part for that.

For Deltarune's teacup rides, the left key makes you go clockwise and the right key makes you go counterclockwise. This way, when you press left/right from the starting position (bottom), you go in that direction.

But I was more used to pressing left to go counterclockwise and pressing right to go clockwise, the same as the controls for Super Hexagon (and its predecessor Hexagon, which is how I got used to those controls). This way, you go left/right when you press left/right from the top instead of the bottom.

So in my latest playthrough, I swapped the left and right controls in the settings whenever there was a teacup section. Actually made those sections quite a bit easier for me.