HN user

num42

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I like:

Unthinkable,Unknowable,Unknown Unknowns,Rums field matrix,...so on

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en.wikipedia.org 1d ago

Covid-19 Misinformation

num42
4pts1
en.wikipedia.org 1d ago

Salami Slicing Tactics

num42
3pts0
www.cs.tufts.edu 2d ago

Reverse Compilation techniques – Cristina Cifuentes(1994) [pdf]

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3pts0
www.youtube.com 2d ago

How the Best Hackers Learn Their Craft(2018)

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2pts0
en.wikipedia.org 6d ago

Precociality and Altriciality

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3pts0
www.callum.website 7d ago

The Matter of Taste(2018)

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2pts0
www.youtube.com 12d ago

What is momentum?(joke video) (2021)

num42
2pts0
www.geol.umd.edu 17d ago

Morphometrics: Introduction to the Analysis of Shape

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27pts0
wangcong.org 21d ago

Personal Taste Is the Moat

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3pts2
en.wikipedia.org 28d ago

Paintings by Adolf Hitler

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5pts0
yourveganfallacyis.com 1mo ago

Your Vegan Fallacy

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6pts1
www.ewg.org 1mo ago

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

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3pts0
thetyrecollective.com 1mo ago

Tire wear particles collecting device for automobiles

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1pts2
en.wikipedia.org 1mo ago

Grigori Perelman

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7pts0
api.mountainscholar.org 1mo ago

Feeding People versus Saving Nature(1996)

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2pts0
blog.djnavarro.net 1mo ago

Linear Cosine Palettes(2025)

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58pts2
en.wikipedia.org 1mo ago

Bond Graph

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4pts0
www.youtube.com 2mo ago

The Life of a Bolt(2016) [video]

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1pts0
veteriankey.com 2mo ago

Canine Anatomy

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2pts0
some.3b1b.co 2mo ago

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

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2pts0
www.youtube.com 2mo ago

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

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2pts0
www.gutenberg.org 2mo ago

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

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2pts0
www.youtube.com 2mo ago

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

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4pts0
www.youtube.com 2mo ago

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

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4pts0
thinktv.pbslearningmedia.org 2mo ago

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

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2pts0
www.youtube.com 2mo ago

Demonstrating the idea of gamma camera imaging [video]

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8pts0
ocw.tudelft.nl 2mo ago

Mechatronic System Design(2023)

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1pts0
annas-archive.gl 2mo ago

The Design of High Performance Mechatronics(2020)

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1pts1
mms.businesswire.com 2mo ago

Maximising the Value of Ajinomoto

num42
1pts0
www.youtube.com 2mo ago

MobED: Mobile Eccentric Droid – A robotic platform from Hyundai (2022) [video]

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1pts1

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.

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/

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/

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

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

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.

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

Programming Is Free 5 months ago

Adding to the original post, yes, a lot of things are free now. Sometimes I feel overwhelmed by the sheer amount of resources available on the internet. At the same time, many topics turn into deep rabbit holes if you look closely enough.

For example, I never realized how much there is to learn about something as simple as a bolt. To me, it was just a cylinder with helical grooves. Then I watched the video “Life of Bolts” on YouTube and was amazed by the number of steps and processes required to manufacture a high-precision, high-performance bolt for a Formula 1 car. Another eye-opening moment was watching “Origin of Precision.” It completely changed the way I look at everyday objects.

Once I started digging deeper into bolts, I discovered how many fields are connected to making them: materials science, process engineering, manufacturing engineering, metrology, precision engineering, and more. I have even come across PhD theses focused on bolts, O-rings, and seals. One time I found a technical paper on O-ring modeling from NASA’s technical server, and it was full of complex partial differential equations. It honestly surprised me how much knowledge and effort go into designing and producing things that seem so simple.

It makes me realize that the biggest bottleneck in learning anything deeply is mathematics. At the same time, you also need some philosophical grounding to ask the right questions, along with the willingness to learn and apply knowledge in the real world.

TL;DR:

Minimize negative(painful) notions as much as possible, ideally approaching zero, while maximizing positive (pleasurable) notions.

Minimize negative(painful) notions: Uncertainty, Risk, Chaotic behavior, Randomness, Non-deterministic, Instability, Cost, Energy losses, Time consumption, Resource usage, Excessive complexity, Failure modes, Noise

Maximize positive(Pleasure) notions: Reliability, Efficiency, Deterministic, Predictability, Precision, Accuracy, Verification, Validation, Safety, Stability, Simplicity (lower complexity), Robustness, Redundancy

I search for nano positioning stages. I didn't get much on that. BTW, great work. Keep it up. UI looks so good.