What is Hackers' Pub?

Hackers' Pub is a place for software engineers to share their knowledge and experience with each other. It's also an ActivityPub-enabled social network, so you can follow your favorite hackers in the fediverse and get their latest posts in your feed.

> ブラザー工業株式会社およびそのOEMベンダーが提供する複数の製品では、初期設定における管理者パスワードは製品のシリアル番号から容易に導出可能です。

JVNVU#93294882: ブラザーおよびそのOEMベンダーが提供する複数の製品における管理者パスワードの初期設定について : 👀
---
jvn.jp/vu/JVNVU93294882/

0
0
0
1
0
1
0

생각보다 많은 슬픔이 있었지만
지나온 날들을 하나하나 되돌아보면
슬픔보다 더 많은 기쁨이 있었던 것 같다
여전히 알 수 없고 불안한 오늘이지만
내 곁에 머무는 모든 순간과 인연을
소중히 여기며 살아가고 싶다

Photo by 서담ㅣ삶의 글 수집가 on September 17, 2025. May be an image of text that says '생각보다 많은 슬픔이 있었지만 지나온 날들을 하나하나 되돌아보면 슬픔보다 많은 기쁨이 있었던 것 같다 여전히 알 수 없고 불안한 오늘이지만 내 곁에 머무는 모든 순간과 인연을 소중히 여기 며 살아가고 싶다 못말'.
0
1
1
1
1
A coastal view with waves crashing on sandy shores, surrounded by rocky cliffs and pine trees under a clear blue sky.Rocky formations dividing turquoise waters with waves gently rolling in, surrounded by lush greenery and a clear sky.A serene beach scene with gentle waves and rocky outcrops, framed by vibrant green foliage in the foreground.
0
1
0
1
1
1
1
0
0
0
0
0
1
0

Wow! The black hole at the center of a nearby galaxy is incredibly dynamic!

In 2017, the magnetic fields near its event horizon were spiraling around one way. By 2018 they settled down. But by 2021, they were spiraling in the opposite direction!

This black hole is incredibly massive: about 6 billion times heavier than our Sun. But it radius is only 120 times the distance between the Sun and the Earth. That's big, but it doesn't take light very long to go that far: just 16 hours. So it's theoretically possible for magnetic fields to change quite fast.

But what's making these magnetic fields? It's hot ionized gas called plasma, spiraling down into the black hole like water going down the drain of your bathtub.... if your bathtub was huge and full of plasma. Did the swirling motion of this stuff change significantly in just a few years? Or just the magnetic fields?

This black hole is called M87* since it's in the middle of a galaxy called M87, which is 55 million light years away. For comparison the Milky Way is 90 thousand light years across, and Andromeda is 2.5 million light years away. But M87 still counts as "close" because its redshift is tiny. The Universe is really big.

This black hole is famous for getting its photo taken back in 2019. So how come we know what it looked like back in 2017? Dunno.

Anyway, the cool part here is that we're starting to *see* the dynamics of magnetic fields near a supermassive black hole. It's like black holes have "weather'. As usual, things are more interesting than the simple theoretical models we had before we saw what's actually going on. Imagine trying to understand weather before you looked at it.

eventhorizontelescope.org/new-

Three images of a blurry reddish-yellow ring with streaks on it.

"New images from the Event Horizon Telescope (EHT) collaboration have revealed a dynamic environment with changing polarization patterns in the magnetic fields of supermassive black hole M87*. As shown in the images above, while M87*’s magnetic fields appeared to spiral one direction in 2017, they settled in 2018 and reversed direction in 2021. The cumulative effects of this polarization change over time suggests that M87* and its surrounding environment are constantly evolving. Credit: EHT Collaboration."
0
0
0
1
0

ここのところデジタルデトックスも兼ねてSNSから離れて、RSSリーダーで好きなサイトだけ巡るということをしている。そこである記事が「AIがますますブラウジングして検索する手間を肩代わりして、複数のサイトから検索内容をまとめて出してくれる時代が来る」というのを書いていた。これからは好きなサイトは直接RSSを登録して更新があるたび個別に見に行く、という時代の逆行が起こるのかもな、とふと思った。

0
0
1
1
0
1
1
1
5
0
1
0
1
1
0

RHEL 계열이 개념, 사용법이 복잡한 경향이 있고 문서, 유저층이 딱딱해서 초보자가 쓰기 어려운 부분이 있는데, 이제는 LLM에 물어보면 잘 알려줘서 굳이 안 쓸 이유가 있나 싶기도 함.

그냥 콘솔 출력 긁어다 던져도 잘 알려주더라.

0
1
0
1
1
2