A chart of the discussion so far around social networks for researchers and scientists:

https://www.solipsys.co.uk/Chartodon/108916713309801412.svg

Click on a node to go to the toot.

People involved include:

@blainsmith

@gerald_leppert

@VictorVenema

@GrassrootsReview

@mpjgregoire

@humanetech

@tio

@futureisfoss

@jorge

@stragu

@devSJR

@pybonacci

@coldwave

@OpenScienceFeed

@jpujolar

How origami is engineering new technological opportunities (https://www.tokyoweekender.com/2022/07/origami-influencing-engineering-technology/): interview with mechanical engineer Sachiko Ishida of Meiji University on applications of folded structures in engineering, and where origami engineering is headed.

Threelds, https://cp4space.hatsya.com/2022/05/25/threelds/

I have no idea whether it's useful for anything, but a threeld is a pair of fields where the multiplication operation on the inner one forms the multiplication on the outer one. The finite ones have inner order 3 and outer order 2, or inner order a Mersenne prime and outer order the adjacent power of two, but there also exist infinite ones with inner field of characteristic 0 and outer of characteristic 2.

A while ago @davidphys1 asked why nobody had made animations of the shunting yard algorithm with cutesy trains.

There is no surer way to summon me!

I've spent some of my spare time over the bank holidays making exactly that: https://somethingorotherwhatever.com/shunting-yard-animation/

Seen on Reddit ...

Q: Why do asteroids always land in craters?

A: That's where they come from. Most people don't realize it, but meteors have much more in common with salmon then they do other heavenly bodies like planets, stars, and moons. Meteorites begin life on earth in craters, then eventually they come back to earth to mate. They seek out the crater where they were born to start the cycle all over again.

I'll stop here. From here, one can get into 2-forms or move to higher dimensions and so on, but for all that, I refer you to the references.

Thanks, as always, for reading.

15/15

Students sometimes wonder why we use quaternions, which are 4D, to represent 3D rotations, when we can use (2D) complex numbers to represent 2D rotations. But that's the wrong way to count dimensions. Complex numbers represent similarity transformations in 2D, which combine 2D rotations (1 degree of freedom) and uniform scalings (another 1 degree of freedom). But 3D rotations have 3 degrees of freedom!

Claas Voelcker on academic work-life balance: https://thegradient.pub/working-on-the-weekends-an-academic-necessity/, via https://news.ycombinator.com/item?id=31562264

I think we all know that many academics (myself included!) struggle to keep our weekend and evening time free of work-related distractions. Voelcker investigates where this pressure to work comes from (often internally) and suggests that overwork may block creativity; taking time off can make you more productive.

Here's a new illustration for the Wikipedia article on Mrs. Miniver's problem, https://en.wikipedia.org/wiki/Mrs._Miniver%27s_problem

The problem asks to arrange two circles so that their intersection (yellow) has the same area as the surrounding parts of the union (blue). It involves solving a transcendental equation, so this seemed like a good time to write a script to find the geometry numerically before switching to a graphics editor to color it in. Source code at https://commons.wikimedia.org/wiki/File:Mrs_Miniver%27s_Problem.svg

I wrote about my Prime Run game on @aperiodical: https://aperiodical.com/2022/05/prime-run/

Joined May 2022