Just two days after her first video,

@jensimmons is back with another video about the #accessibility #inspector in the

#Firefox #Developer #Tools. This time, she looks at color contrast, color vision deficiency simulator, underlined links because they're beautiful. #a11y #webdev

https://www.youtube.com/watch?v=eBefjaWud-M

Today at lunch, I've learned about the Trash Compaction problem: Can you push objects on a grid into the compact shape of a rectangle if you're only allowed to push all objects from one side simultaneously. Akitaya, Aloupis, Löffler, and Rounds showed that the problem is NP-complete.

The fun variant of this problem talks about pushing around coconuts with a giant coconut pusher... Here are some neat slides: http://www.staff.science.uu.nl/~loffl001/publications/slides/trash_compaction.pdf

I have a jar containing tea bags, which come in pairs. When I want to make a cup of tea, I reach into the jar and pull a random bag out. If it's part of a pair, I rip it and put the other bag back.

I can't remember how many times I've made tea since filling the jar. What's the probability that I pull out a single tea bag next time?

UK residents: register to vote now, like right now

@ctdunc it's a classic!

This app can give me a name for a colour, so I could use it to for example pick a green t-shirt instead of a yellow one.

It doesn't give me a sense of which colours go well together, or which colours look 'nice'.

I used to have an app which simulated what I see in realtime, but it was for an old version of android

@quarky go ahead

It can identify colours (but it's got so many names that it's quite jittery) and filter so you can see differences, if not real colours. It doesn't have a simulate mode, which means I can't show others what I see.

I can see the train of thought for someone new to programming: I have a variable called $x, and a variable called $y, and I want to use one or the other based on some changing condition. So, I should be able to ask for a variable with a name which is itself a variable

@cpsdqs oh wow! That feels very unsafe

Thinking Outside the Plane: https://www.metafilter.com/183649/Thinking-Outside-the-Plane

Interesting roundup of 3d solutions to 2d problems, starting with Tarski's plank problem: Can you cover a diameter-\(n\) disk with fewer than \(n\) unit-width strips?

Sadly, they missed the 3d proof of Desargues' theorem: https://en.wikipedia.org/wiki/Desargues%27s_theorem#Three-dimensional_proof

There's also a 2d-3d connection with Miquel's six-circle theorem but I think it goes the other way: https://11011110.github.io/blog/2006/03/22/miquels-six-circles.html

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