I am coming back from an amazing weekend in Switzerland about suffering focused ethics. We talked about how to reduce suffering in the world in the most efficient way, in the long term, for all sentient beings. I had excellent deep discussions and feel more motivated than ever to make the world less bad on expected value as much as I can.
During my last flight, in an A320, I was lucky to see a shockwave on the wing. It is visible on the picture between the bottom left corner and the left of the yellow object.
What you see is the very fast variation (almost a discontinuity) in the refraction index of air, which varies with density. The flow is locally supersonic before (left on the picture) the shockwave, and is decelerated back to subsonic speeds and compressed through the shockwave. Its thickness is of the order of a few mean free paths of the air molecules (the mean distance a molecule travels before colliding with another).
Taken with a Pentax K-x and an old manual focus 50 mm f/1.7 at f/4.
Scott Alexander about public comment sections: https://slatestarcodex.com/2019/02/22/rip-culture-war-thread/
I strongly recommend his blog, "about science, medicine, philosophy, politics, and futurism". He is a psychiatrist and there is, among many other things, some very interesting discussions about drugs and brains. He conducts a survey of his readers every year that sometimes yields surprising results. This year, there was unfortunately no significant correlation between corn eating habits and preferences between algebra and analysis.
2.7 million medical calls breached in Sweden
The calls were stored on a NAS connected to the internet with no authentication or encryption, with people's phone numbers in the file names of audio files
My laptop just crashed, displaying scary I/O errors, filesystem remounted read-only, etc. I rebooted it and everything is fine. A year ago I had the motherboard changed under warranty for a similar issue (but worse, it consistently failed after reading a few megabytes at most). The SSD itself was totally fine. I hope it's not happening again.
The Big 1.0. – Riot
Riot, the default and most mature client for #Matrix just hit 1.0, with a huge redesign <3 If you have ever checked Riot before, but didn't like the looks - please give it another try! If you haven't tried it but like things like, dunno, #Slack for example, have a try and you might be pleasantly surprised.
Leaving tomorrow for #Göttingen and I'm not ready. But it's going to be fun!
Generalistic Mastodon instance for open-minded people. Instance Mastodon généraliste pour personnes ouvertes d'esprit.