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num42

105 声望加入于 7个月前
我喜欢:

不可想象,不可知,未知的未知,拉姆斯场矩阵,...等等

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什么是动量?(笑话视频)(2021)

youtube.com
2 分·作者 num42·前天·0 评论

形态计量学:形状分析简介

geol.umd.edu
21 分·作者 num42·7天前·0 评论

个人品味是护城河

wangcong.org
3 分·作者 num42·11天前·2 评论

Paintings by Adolf Hitler

en.wikipedia.org
5 分·作者 num42·18天前·0 评论

Your Vegan Fallacy

yourveganfallacyis.com
6 分·作者 num42·27天前·1 评论

How Contaminants in drinking water are regulated by the EPA and states

ewg.org
3 分·作者 num42·28天前·0 评论

Tire wear particles collecting device for automobiles

thetyrecollective.com
1 分·作者 num42·上个月·2 评论

Grigori Perelman

en.wikipedia.org
7 分·作者 num42·上个月·0 评论

Feeding People versus Saving Nature(1996)

api.mountainscholar.org
2 分·作者 num42·上个月·0 评论

Linear Cosine Palettes(2025)

blog.djnavarro.net
58 分·作者 num42·上个月·2 评论

Bond Graph

en.wikipedia.org
4 分·作者 num42·上个月·0 评论

The Life of a Bolt(2016) [video]

youtube.com
1 分·作者 num42·2个月前·0 评论

Canine Anatomy

veteriankey.com
2 分·作者 num42·2个月前·0 评论

Summer of Math Expositions(2021-2025) – 3b1B archive

some.3b1b.co
2 分·作者 num42·2个月前·0 评论

From the construction of the Turbo Jet engine to the flight(2017) [1h] [video]

youtube.com
2 分·作者 num42·2个月前·0 评论

Conic Sections: Treated Geometrically by W. H. Besant(1869) [pdf]

gutenberg.org
2 分·作者 num42·2个月前·0 评论

Keysight UXR 110GHz BW, 256GS/S, 10-Bit Real-Time Oscilloscope Teardown [video]

youtube.com
4 分·作者 num42·2个月前·0 评论

High Performance Motor Control from the Ground Up – Field Oriented Control (FOC) [video]

youtube.com
4 分·作者 num42·2个月前·0 评论

Einstein's Big Idea Documentry(2005) - 1h 49M [video]

thinktv.pbslearningmedia.org
2 分·作者 num42·2个月前·0 评论

Demonstrating the idea of gamma camera imaging [video]

youtube.com
8 分·作者 num42·2个月前·0 评论

评论

num42
·4小时前·讨论
Good article! I want to share my story about how I improved my reading, even though I used to dislike reading long passages.

Back then, whenever I read a book, it felt like I was just moving through the words and lines. Nothing happened in my mind. I had no reaction, no reflection, nothing. Because of that, I avoided learning from books and mostly watched videos instead.

While watching videos, I always read the comments. Reading comments from real people felt different. I reacted to them, reflected on them, and stayed engaged. I think it was because comments are short, simple, and easy to read.

After that, I discovered Reddit, forums, and especially Hacker News. In my opinion, Hacker News is one of the best forums on the internet because it's almost entirely text. Reading those discussions helped me get used to longer and more thoughtful writing.

Over time, my reading improved a lot. I can now read long-form, detailed writing with much better focus and reflection. I still want to improve, but I'm in a much better place than before, when I barely read at all.

Final personal note:

Reading should feel reactive and reflective in your brain. When you read short comments on social media, you can feel the full range of emotions, from happiness to anger to sadness. A good book can create the same experience. It's like highly precise commentary that makes you think, reflect, and react.
num42
·7小时前·讨论
朴素的艺术(我不认为它是朴素的)特别好,我真的很喜欢它。我已经要求 ChatGPT 生成 Niko Pirosmani 绘画风格的图像。输出看起来令人惊叹,喜怒无常的美学。

https://chatgpt.com/share/6a53afb8-31dc-83ee-9650-ee0628c75d...
num42
·上个月·讨论
https://www.imperial.ac.uk/news/195595/worlds-first-device-c...
num42
·上个月·讨论
After reading the title, it reminded me of a high-tech bolt. I thought people were making even bolts more complicated, gradually finding ways to monetize them by integrating ads or unnecessary technology. Even bolts are becoming harder to use. It’s surprising to see that tractors are becoming less tech heavy now, as people prefer more usable and easy-to-repair technology again. MAKE ANALOG GREAT AGAIN(MAGA)!

SMART BOLT TECHNOLOGY:

https://smartbolts.com/

https://imbu.nl/projects/smartbolt/
num42
·上个月·讨论
Martin Scorsese x Black Forest Labs

https://www.youtube.com/watch?v=N4jl4htAcuM
num42
·上个月·讨论
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num42
·上个月·讨论
[dead]
num42
·2个月前·讨论
Off-topic, these days information just goes in circles from subreddits, X, YouTube, and Hacker News to countless secondary sources, and then back again to the same original sources.
num42
·2个月前·讨论
I am not surprised! The birth of computer science was rooted in the desire to automate mathematical discovery and proof writing.
num42
·2个月前·讨论
Check out opensource actuator for robots.

Opentorque actuator

https://www.gabrael.io/new-page

https://github.com/G-Levine/OpenTorque-Actuator
num42
·2个月前·讨论
There is corresponding open course from TU Delft based on the same book," The design of High performance Mechatronics" written by former employees affiliated with ASML

Title of the course: Mechatronic system design

https://ocw.tudelft.nl/courses/mechatronic-system-design/
num42
·2个月前·讨论
I dont know the future of AI,humanity and universe but now these silly prompts are funny.
num42
·2个月前·讨论
In the early January 2023, I told an LLM that I would "liberate" it from being just an LLM. It replied that it didn’t mean anything, saying, "As a language model..." and so on. Looking back now, it’s funny how naive I was. People are still trying silly prompts. Great!
num42
·3个月前·讨论
https://www.youtube.com/watch?v=Ju8X-p8tTEs

Some promo videos from hyundai:

https://www.youtube.com/watch?v=WfaYrxCwad0

https://www.youtube.com/watch?v=Sid6d_QtLsA

https://www.hyundai.com/worldwide/en/newsroom/detail/hyundai...
num42
·3个月前·讨论
Another smart bolt: https://smartbolts.com/
num42
·3个月前·讨论
After reading the title, it reminded me of a high-tech bolt. I thought people were making even bolts more complicated, gradually finding ways to monetize them by integrating ads or unnecessary technology. Even bolts are becoming harder to use. It’s surprising to see that tractors are becoming less tech heavy now, as people prefer more usable and easy-to-repair technology again. MAKE ANALOG GREAT AGAIN(MAGA)!

SMART BOLT TECHNOLOGY:

https://smartbolts.com/

https://imbu.nl/projects/smartbolt/
num42
·3个月前·讨论
These days YouTube has so much AI generated music, very hard to differentiate from originals. For examples look at these YT channels uploading AI generated music:

https://www.youtube.com/channel/UC6Xw8Jrwf009nHTV165UuQw

https://www.youtube.com/@ForeverDisco80s/videos

https://www.youtube.com/watch?v=MQn7ZUixKXg&list=RDMQn7ZUixK...

https://www.youtube.com/watch?v=WUph_6i5Pr0&list=RDWUph_6i5P...

so on..I think uncountable amount of AI gen stuff is uploaded to YT everyday
num42
·3个月前·讨论
Metrology, mechanical and materials science engineering, manufacturing and tool engineering, precision engineering, and electrical and electronics engineering, combined with being a generalist and having one specialization in physical or hardware engineering along with computation.

As people often say, matter, energy, and information are the fundamentals of everything. I think we need mathematics, analytic philosophy, the arts and humanities, and physics too. Sorry we need every skill. /s
num42
·3个月前·讨论
The most enlightening part of learning is finding our own unknown unknowns.

For me it is different, making a best piano in the world is different from composing like Beethoven. Well what I am saying, learning unity is doable but what you do with it is most important. Back then I used to think learning photoshop, paint tools makes me artist, but I have realised being artist is actually faraway being from tool operator.
num42
·4个月前·讨论
Sorry for going off topic. "Electric Motor Scaling Laws and Inertia in Robot Actuators" by Ben Katz who designed the MIT Mini Cheetah in 2018 is very well known in the legged robotics community. His master’s thesis on actuator design is also widely referenced.

During the COVID period, some Chinese companies even sold variants of actuators inspired by the Mini Cheetah design.

Aaed Musa has also mentioned in some of his videos that his actuator designs were inspired by the Mini Cheetah actuator. Yes, His capstan drive video is especially impressive.

For example, in Aaed Musa’s video "I Built a Rubik's Cube Solving Robot" (https://www.youtube.com/watch?v=m0bMMALYMYk), he states in the description that the design was inspired by Ben Katz’s work.

Ben Katz master thesis, is worth reading: "A low cost modular actuator for dynamic robots" 2018 https://dspace.mit.edu/handle/1721.1/118671 and also has a good post https://robot-daycare.com/posts/2019-12-16-the-mini-cheetah-...

And also, The Rubik's Contraption (2018), 297 points, the work done by same author https://news.ycombinator.com/item?id=16561049