kilovoltaire

Since there's currently an article about quaternions on the front page, it felt like a good time to bring up bivectors, which in my opinion are a much more elegant way to do rotations.

Particularly, I think this part is insightful:

> In 3D, a bivector has three coordinates, one per plane: (xy, xz, and yz). Vectors also have three coordinates, one per axis (x, y and z). Each plane is perpendicular to one axis. This is a coincidence that only happens in three dimensions and it is why historically we have been confusing bivectors with vectors.

Came here to say this!

I always felt like quaternions weren't a perfect fit for 3d rotation, and when I finally learned about bivectors my faith in the elegance of mathematics was restored :D

I liked this article: https://marctenbosch.com/quaternions/

Meanwhile human NES Tetris is also getting unbelievably good, including a whole new method of 'rolling' your fingers across the back of the controller

Here's a video of a former world champion 'hypertapper' Joseph versus the newly ascendant 'roller' Huff, from the world championship a couple weeks ago.

They both reach a million points (called a 'max out' because the unmodified game stops counting after that) at around 9 minutes in to the video:

https://youtu.be/wELh6bO_ze0?t=9m

I really liked this Not Just Bikes video because it shows that it's not just a zero-sum bikes-vs-cars situation, intelligent urban design can be better for everyone!

These don't seem to work very well for me, but I still thought it was a very interesting idea, plus it just looks really cool/crazy

I think you misread the code, the comparison is the opposite of what you might expect, so a[i] is always the largest element, and it is not inserted into a[1..i-1]

Note that the comparison is backwards, so by that line of thinking it would sort in reverse (descending) order …but it doesn't

I was surprised I had never heard of this until today

It would have been amazing to witness

If you're wondering why I shared it again, I got an email(!) from HN inviting me to share it again, which is an interesting thing I didn't know existed

You can read more about it here: https://news.ycombinator.com/item?id=26998308

And see other invited posts here: https://news.ycombinator.com/invited

I love the use of patch cables to make graphics, like a visual modular synthesizer

In my opinion you've removed very important context from this quote.

As mentioned elsewhere, the full quote is very different:

“information about public voting procedures, political candidate eligibility based on age / birthplace, election results, or census participation that contradicts official government records”

I assume any Spotify-only podcast is because Spotify is paying them to be exclusive?

tl;dr from the article:

    The http(s): gets interpreted as a label
    The // immediately following the label starts a comment

Archived link [pdf]: https://web.archive.org/web/20210414165446if_/http://media.a...

Archived link [pdf]: https://web.archive.org/web/20210414165446if_/http://media.a...

I recently did this too, took about a week to get in the habit but now it's great!

There's a discussion of a rebuttal to this here- https://news.ycombinator.com/item?id=26612952

(Also it's newer and more upvoted but for some reason no longer on the front page?)

Just came here to ask about this too

Seems a bit sketchy for the other article to be on front page, but its newer, more-upvoted rebuttal to be removed

@dang if you see this, I would love to understand the reason

Posting this in case anyone else was curious to see the code addressing the "20% of requests for Wikimedia Commons are for one image of a flower" thing from yesterday - https://news.ycombinator.com/item?id=26072025

The list of authors doesn't include Michael Nielsen or Andy Matuschak so I guess not.

(Aside: I learned so much from Quantum Country!)

Wow yeah agreed. Direct link for convenience:

https://www.ics.uci.edu/~eppstein/junkyard/euler/noah.html

The "scroll to text fragment" Chrome feature used to make this work seems almost unbelievably hacky to me… I really hope it doesn't become standard

https://chromestatus.com/feature/4733392803332096

Personally I find this pretty annoying—yellow text can be hard to read, and unexpectedly arriving in the middle of a webpage can be disconcerting.

I recently saw someone playing around with i3 and xzoom to make fractals and video feedback, seems fun- https://twitter.com/maxbittker/status/1228241766240768000

The Crackbook Revival chrome extension he mentions restarts its timer if you switch tabs, so at least it remains effective despite tabs

There is a photo and a diagram in the carousel at the top of the page. (Though I agree it's easy to miss.)

If you want to learn more about the quantum search algorithm, I got a lot out of this pretty in-depth essay on how it works-

https://quantum.country/search

I recently finished https://quantum.country which covers the quantum search algorithm (and which I highly recommend)

So I really enjoyed this article (by the 3Blue1Brown guy) since it discusses a clever physical analogue of quantum search