Comments URL: https://news.ycombinator.com/item?id=47500434

Points: 2

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Comments URL: https://news.ycombinator.com/item?id=47446827

Points: 10

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Comments URL: https://news.ycombinator.com/item?id=47287846

Points: 1

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7K is considered “warm” from a cryogenics point-of-view because you can just dunk your sample into a dewar of liquid helium at 4.2K. You can even get it cooler, down to about 1K, using evaporative cooling techniques. [1]

It’s getting to lower temperatures than this when things start getting complicated. Eg a closed-cycle evaporative He3 system can get you down to 200 mK, or you can bite the bullet and use a dilution fridge down to around 10mK.

[1] https://en.wikipedia.org/wiki/1-K_pot

(not sure what are the unwritten rules of self-promotion here, but hopefully providing a link in a sub-comment instead of the comment itself makes it okay-ish?)

https://www.youtube.com/watch?v=qI3xj9cM0jk

I had a minor panic/WTF moment when I saw the submission saying : "Streets of London [video] (youtube.com)".

Comments URL: https://news.ycombinator.com/item?id=47079021

Points: 8

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I recently bought my mom flowers for her birthday. Despite the price showing no delivery fee, the final price included $15 delivery charge, $8 service charge, taxes, and then asked me for a tip.

I chose no tip, expecting the delivery and service charge should cover everything.

The flowers were left on her front porch in below-freezing weather, they didn’t even knock or ring the doorbell. Luckily my mom happened to open the door and saw them before they completely froze.

So was the delivery person incompetent, or acting out because I didn’t add additional tip?

https://tinney.net/

1. Low-noise applications. I’d naively expect the 555 to be less noisy than a clocked digital microcontroller, though it’s been awhile since I’ve worked in this space.

2. Low power applications. How does latent power draw compare between a 555 and a typical low power microcontroller?

They used to show news channels.

He said clients would come in all stressed out. So they changed to a home improvement channel.

But hey, at least the luggage carts are free…

- Brian Kernighan

Most of the students have either some degree of hearing or use cochlear implants. I think nearly all, if not all, students use either hearing aids or cochlear implants.

The classes are very small (eg 5-6 max usually), students are arranged in a U-shape around the teacher so they can read lips. And there’s a special wireless broadcast system so the teacher wears a microphone and sends the audio directly to hearing aids or cochlear implants.

Regarding deaf culture, most of the students use BSL on their own outside class, and my daughter learned BSL from her friends there that grew up with it. Coming from a mainstream primary, she found “her people” here, discovered deaf culture and a community that shares the same struggles she faces.

The idea is that by teaching in BSL the students are further restricted in their ability to function in a hearing society.

I’m curious if you are deaf yourself, or work with the deaf. All the teachers at the school are trained teachers of the deaf, some are even deaf themselves. And I haven’t heard any complaints about the aural nature of the learning (except from the reservations of a few parents before sending their kids there, and I don’t think any of these parents regrets this after their children started there.)

Five years ago ARISS-UK pre-arranged a connection between the school and astronaut Mark Vande Hei on one of the ISS flyovers. Various students got to ask questions directly to Mark in orbit. It was the first contact between ISS and a deaf school.

https://www.arrl.org/news/ariss-confirms-october-12-as-date-...

When I took quantum mechanics in grad school, I struggled through the weekly (and intense) homework sets. My TA was a hardass, I’d spend hours on some problem, several few pages of math work just for one problem, and make some dumb mistake in an integral somewhere, being off by a factor of 2 at the end and only getting 2 of 4 points.

It was painful, and I felt like a dumbass seeing the other kids regularly getting perfect scores.

Then the midterm came and I blew them all out of the water. I hadn’t realised they somehow had the solutions manual so just got perfect scores all along but clearly didn’t learn the material like I did.