skysight-inc/HackerNews huggingface dataset:
Some favorites below. Books 0-3 are accessible. The remaining books are more difficult but I'd highly recommend them to math students.

0. Jan Gullberg, Mathematics, From the Birth of Numbers. A highly accessible popular survey on different branches of higher mathematics. I read this over the Summer between high school and starting my undergraduate degree. It's what made me want to study math. Previously I'd wanted to be a guitar player, but had to find a new ambition after an injury left me unable to play.

1. The high school mathematics series by Israel Gelfand. Algebra, Trigonometry, The Method of Coordinates, and Functions and Graphs. I
didn't have much mathematics background in high school, but working through these really solidified my grasp on the basics.

2. George Polya. How to Solve it. A short book giving excellent high level advice on mathematical problem solving.

3. George E. Andrews, Number Theory. I worked through this freshman year contemporaneously with my first proof based class on simple logic and set theory. A very beautiful and accessible introduction to basic number theory. The combinatorial/geometric proofs of Fermat's Little Theorem and Wilson's Theorem are lovely. It also includes a very nice proof of Chebyshev's theorem on the asymptotic density of primes and even the Rogers-Ramanujan identities for integer partitions.

4. Vladimir Arnold, Ordinary Differential Equations: Undergrad ODE classes are often taught in a cookbook fashion and if so, don't offer much enlightenment. This book explains what's going on at geometrical level. I didn't appreciate ODEs until I read this. See https://www.uni-muenster.de/Physik.TP/~munsteg/arnold.html for Arnold's views on teaching mathematics.

5. E.C. Titchmarsh The Theory of Functions: Recommended by my undergraduate advisor because he noticed that I liked reading older books. It contains sections on complex analysis and real analysis with measure theory, but I've only read the complex analysis sections. It's not for everyone, if I recall correctly, there is not a single picture, but it is very lively and has a lot of material you won't find in a standard complex analysis book, including Dirichlet series. Excellent as a supplement to a standard complex analysis book.

6. George Polya. Mathematics and Plausible Reasoning. An excellent expansion on Polya's ideas on How to Solve it. While the goal is to seek rigorous proofs, to get there it's powerful to be able to think based on intuition, heuristics, and plausible reasoning. A lot of math exposition is theorem/proof based and doesn't help develop these skills. In a similar vein, see also Terence Tao's classic post There's more to mathematics than rigour and proofs https://terrytao.wordpress.com/career-advice/theres-more-to-....

7. H.S.M Coxeter, An Introduction to Geometry. A book of very beautiful classical geometry. Something typically not touched on at all in a typical mathematics curriculum.
Great, now instead of turning the 95% of all extracted oil into greenhouse gases, we now can turn the 99+%. That is efficiency.
I've been going with yelling "Silenzio, Bruno!" [1].

[1] https://www.youtube.com/watch?v=754u7BL1Tkk
Sure, but neither Google nor Facebook are your parents.

And a US citizen has much more to lose if their private data is being shared with the US government than with the Chinese government.
For that size I would use a 1X or 4X microscope objective attached to a camera (this is in fact how my DIY automated microscope at home for looking at tardigrades does it).

I don't understand the part about needing high light intensity- at such low magnification, I have to attenuate my LEDs significantly and take extremely short exposures (like, running a 1A LED at 10mA and 1-10us exposures). But I can't fault his results.
Crazy talk you say?

Consider most graduates who have studied “modern”information are familiar with this one “entropy described the number of states in a system”.

The number of states does not include exceptions (cosmic rays, terminal conditions, irregularities, etc. potential distributed over negative potential? Covers it.

What about entropy as laws of thermodynamics? How does distribution of potential over negative potential not cover heat dissipation?

What about this absurd correlation with heat and time? Potential over negative potential describes this phenomena better.

I don’t expect you to take the random commenters’ word, just look at how convoluted these alternate explanations are compared to this explanation. There is something to be desired.

I have more…

Intelligence is the mitigation of uncertainty, if it doesn’t mitigate uncertainty it isn’t intelligence.

Power is the capacity for effect, if it isn’t effective it isn’t powerful.

Uncertainty is obviously the softcore word for entropy (probabilistic distribution of potential.)
The more important part is that you end up with a binary instead of needing an interpreted language which makes the tooling a mess. Python and Ruby are the same thing to most people.
Are cows at sea the future of farming?
The problem is you could have said the same in the 90s for veggie burgers. Existing and slowly expanding doesn't mean it hasn't been a flop - especially considering the monumental amount of capital & hype that was put behind plant based meat

From that perspective, it's definitely been a flop (so far). Jury is still out on long-term lab grown meat.
Ah yes, Fox News. The source of all bad thought is not the global liberal hegemony, but rather its kayfabe opposition.
A bit tangential, but, recently my partner had her Google Drive with around ~3.000 files in the root folder (created mostly by Google Classroom), which means the Files app of the iPad couldn't show them all, because for some reason it limits to 500 files only.

So naturally the next step was to try to clean the directory.
We tried through the webpage, deleting by chunks of 300 files consumed around ~8GB of RAM... and it was slow as hell, and her laptop is a bit old.
I moved onto my desktop and selecting 500 files consumed ~10GB of RAM, it was still slow.

I thought of using Google Colab to access to the Drive as filesystem but no dice there either because the google account wasn't managed by her.

At the end, we tried the iPad app, it took like 8 minutes to be able to select all files, and when deleting them, it took about an hour to actually do it, I imagine it was submitted by batches.

It was stupidly painful.
Your first idea is great. Unfortunately, combustion in pure oxygen runs extremely hot, so hot that it's difficult to find materials to build a stove.

https://en.wikipedia.org/wiki/Oxy-fuel_combustion_process
I know Spotify does a lot of analysis and clever things with the music on their platform, but there's the kicker, they actually have licenses and whatnot to the music, which I'm sure includes a clause for statistical / data-driven analysis.

I wonder if that license extends to deriving a ML model from it. I know there's some ML models out there already that can produce music based on a prompt, but that'll be limited to what music the authors have available to them. Spotify (and Apple Music, and the others) have millions upon millions of tracks available to them.
> it is the most environmentally friendly option

Its not. You need 30 kg of grain or other edible product to make just 1 kg of meat. We are literally turning more food to less food.

An unrelated statistic showed that if the world has increased its meat consumption just a little bit more, we would run out of food. The conversion rate is that bad.

...

Context:

https://www.worldanimalprotection.us/blogs/hidden-driver-fac...

> It is estimated that livestock consume 70% of the grain grown in the US, and that half of the water consumed in the US is used to grow grain for cattle
The latter.

The robot is able to balance by itself during complex dynamic movements, has it's own vision system to know where to plan to put its feet, etc.

What it doesn't have is any intelligence - it's not making any high level decisions, only these type of low level foot/limb placement/movement and balance decisions necessary to execute the sequence of moves it has been choreographed to execute. Maybe not so much different than an accomplished ballet dancer faithfully executing a choreographed dance - the overall plan is fixed (even if the dancer could change it), but there's still considerable skills needed to execute the sequence!

I believe there's a difference between different Boston Dynamics robots in terms of degree of autonomy though - how high level the "choreographed" instructions can be. Their "Spot" dog-like robot seems more capable in this regard than the humanoid "Atlas", despite Atlas being much more impressive in terms of dynamic balance etc.
I had a similar experience with Raymond Smullyan's books, particularly
The Gödelian Puzzle Book: https://www.raymondsmullyan.com/books/the-godelian-puzzle-bo.... Recreational math is quite underrated.
Ancient Software (Terragen Classic)
I second this sentiment. General advice is to avoid things in boxes and bags: aka highly processed foods.

The ingredients list on the beyond meat website looks like this: Water, pea protein*, expeller-pressed canola oil, refined coconut oil, rice protein, natural flavors, dried yeast, cocoa butter, methylcellulose, and less than 1% of potato starch, salt, potassium chloride, beet juice color, apple extract, pomegranate concentrate, sunflower lecithin, vinegar, lemon juice concentrate, vitamins and minerals

What are you really eating?
at such low magnification, the depth of field (not field of view) is pretty big, you can usually see significant out-of-focus detail. But normally people just put the sample in a well and cover it with a coverslip, which makes a thin section.
I always get laughed at when voicing this, but I was one of the (admittedly ridiculous-looking) people who tried out the Google Glass when it came out. It was, in many ways, a bad product, but if you could abstract away from how goofy it looked or how bad the battery life was, it was kinda awesome. I tried hard for a couple weeks to use it exclusively, and granted that back then my phone wasn't as much an appendage as it is now, but I found the experience of going back to my phone deeply disappointing. It made me aware, in a way I thought impossible, of just how much I strain my neck all day long to look at the phone, for instance. Calling my wife on Hangout and having her see what I'm seeing and picking groceries together while she was at work was a very neat experience... to have map overlay as I drove on my glasses, too, was awesome.

That's all to say, I think anyone who implements a pretty good version of this with modern tech will usher in glasses as the new compute form factor. Which, paradoxically, is why I think Apple may be the last to do this. Good AR tech will absolutely destroy the iPhone... either they'll do it when they think they are ABSOLUTELY CONVINCED they can successfully cannibalize their own product, OR somehow the iPhone proves to start becoming an unsuccessful business on its own right. I think those two things are pretty unlikely; far likelier for META to keep their nose to the grindstone and perhaps, just perhaps, knock something out of the park.
How Tesla Probably Cut the Model 3's Price to $45,000
Unrelated to aviation, but I actually find METARs and TAFs are useful for hiking and skiing. I use the altimeter settings for my altimeter when hiking, and knowing the altitude of cloud layers is useful to know what the visibility will be like on the mountain (you have to do a bit of math with the airport elevation and the mountain’s elevation, but hey—it works!).
An annual problem I have every summer is dealing with smoky campfires when camping. Your bog standard cicle-of-rocks or metal ring fire pit is crazy inefficient, and unless you run continuously in the offgassing phase (bright, tall orange flames, as the wood gas burns off), with lots of convection, you inevitably produce a ton of smoke. This is terrible for all folks, but my asthma-prone lungs get especially cranky. So you either have to continuously feed wood (inefficient and costly), or play the game of shuffling upwind constantly.

I usually end up tinkering and modifying the fire pit to try to eek some better air flow patterns, but it's usually a lost cause with open pit fires.

I might just cave and get one of those stainless inserts, but what I'd really like is something flatpack that I could assemble into a more efficient burner. I've seen small ones [1] that slot together to make a rocket stove, but nothing campfire sized.

I wonder how much demand there would be for such a thing. Seems like there are several products for general "firepit" designs, but without a chimney, these suffer from most of the same problems as open pits. [2][3]

Edit: oh, maybe a "tent stove" is what I'm looking for.

[1] https://www.amazon.com/Marsh-Kettles-Flat-Rocket-Stove/dp/B0...

[2] https://www.amazon.com/Flat-pack-firepit-grill-carry/dp/B086...

[3] https://www.etsy.com/listing/799723294/flatpack-firepit-port...
Seconding the video's recommendation for the book "Dilla Time", which is also apparently going to be a documentary soon. Highly, highly recommended for anyone into electronic music production, hip hop, neo soul, Dilla, contemporary jazz, swung beats, wonky time, fucking around with rhythm, etc.

https://www.barnesandnoble.com/w/dilla-time-dan-charnas/1140...
Alternative are cropping up.
I've been testing out solutions with other nerds.

https://www.beeper.com/ is promising. It's set of matrix bridge over 15 chat network or so.

Neat.
What, no, burning it is surely better than digging up previously buried stuff to refine and burn.

Only if we approach a 0 drilling world would it make sense to bury plastic instead of burn it.
”Road to reality” by Roger Penrose is an interesting book as a refresher and review if the content is otherwise within familiar territory.
Agreed. My family has a long history of cardiovascular problems so I am trying to cut down on red meat myself to possibly extend my life...but dangit I want some chicken fried steak and cheeseburgers. I might use impossible burgers to satiate my cravings in a heart-healthy way, but it just isn't the same.
Ah yes, I had my finger above the buy button yesterday but I need to get a new phone to use it on the go which I am holding off on. Please write down your experience; it really looks pretty great from the reviews. No batteries in the glasses are great as well.
I'm not sure, unfortunately. If Google offered a way to test that without paying, I'd happily do it but Apple Music serves our needs really well.
And what really mean to be "in the right place"? I think the idea is to stop thinking about the place you are right now, because that's the result of your earlier choices and you can't change that anyway. It is the "right place" for now. But you can start to think about what you can do to get to the place you want to be if there is one. Or maybe accept that life is not always about getting somewhere but about appreciate where you are, because life will never be perfect.
Linear Algebra Done Right by Sheldon Axler is indeed a good book if you are looking for a rigorous proof based book to learn linear algebra.

Here [1] you can find Sheldon Axler himself explaining the topics of the book in his YouTube channel! How wonderful is that!

Here [2] you can find the solutions to the exercises in the book.

This [3] Lectures might help as well, among the books this course follow is Algebra Done Right.

Good luck learning the subject of Linear Algebra you'll have fun doing so.

[1] https://www.youtube.com/playlist?list=PLGAnmvB9m7zOBVCZBUUmS...

[2] http://linearalgebras.com/

[3] http://nptel.ac.in/courses/111106051/
Scientists Fire Lasers at the Sky to Control Lightning
That's debatable - the Quest Pro has been roundly criticised for having passthrough that isn't good enough for many AR applications (e.g.: you can't read text through it and it has very poor temporal stability), while being marketed for those applications. If they can't do great passthrough at 1,500 dollars, it unlikely that they'll do good passthrough for 400. Hope to be proven wrong, as I'd love to use a headset for productivity.

There's a good overview here - https://kguttag.com/2023/01/03/meta-quest-pro-part-1-unbelie...
Space Cadet Pinball uses GDI. Mostly Bitblt.
ABC (the TV network) paid out a couple hundred million in a defamation suit for that scandal.
> Good, I don't think the masses are clamoring for AR glasses

Oh, I think they are.

But they want the SF movie AR glasses. Aka regular glasses just with a ton of extra tech.

What I mean by this is that AR glasses look a lot like the next major OS.

Mainframes - minicomputers - workstations - PCs - laptops - tables - smartphones - (minor impact compared to rest) smartwatches/wireless headphones/earbuds - ... - AR glasses.
I remembered that some sites use a small spinner on the edge of textarea or something similar to indicate "I am uploading your text to cloud / I am saving your text to disk".

I think it's a good design that tell users your changes are persisted "now" ?

And this can be probably applied to all options that take effects instantly.
FYI, "rclone" is a good tool to access proprietary cloud storage platforms from a consistent CLI.
Well one hopes this is an enabler of a more-closed loop process for plastics. But… yeah.
an inflated self image seems to be associated with happier less stressed people

i found that the more delusional i get myself, the happier i am.

maybe bad long term but feel better than seeing the “truth”, whatever that is anyways
The watch has a very small display surface. Glasses can potentially use your whole field of vision. You could display an entire room full of monitors rendering full size web browsers and other applications. So there's a huge difference in what info you could see.
But at least we save some landfill space. Also micro-plastics contamination is everywhere.
Yep. Not knowing the atmospheric pressure can lead to planes crashing, especially if it's inclement weather.
Maybe there's an ongoing cyber attack ? :-)
we always could - burning the plastic always was an option, and effectively happens in a lot of places (incinerator). Recycling into oil would give us the option to use it as input to either new plastic or other hydrocarbon based products.

Now, whether this works as advertised is an open question.
Fake meat is generally aimed more at meat eaters than people who are already vegetarian or vegan. If you already like tofu and seitan, you probably aren't trading those in for the new products.
Yea. It’s doable, but I found that I needed to scale the UI to read comfortably. For normal UI elements, I mostly knew what the buttons did and didn’t need to read them, but its like using a TV as a computer monitor… its just far enough away that everything felt too small.

The resolution isn’t quite high enough for fine text details and unlike VR goggles, glasses aren’t as secured to your head so it shakes more. Again, making focusing on text harder.

That said, they’re good enough for use in a pinch (eg. on a plane, I tried this). They prove the tech is around the corner. They work, they do what they’re advertised, they just need to refine a bit. 1-2 years if people keep buying them and the proper version would be made I suspect. But they work today if you’re really into it.

Surprising, but I actually like the oculus screen sharing, in terms of ability to focus and read the screen. The headset is too heavy and resolution too small, but I like the experience. The NReal is slightly worse in some regards, and slightly better in others.

Edit: they have 2 modes. One is as a USBC monitor, and the other is where your computer (via an app) projects virtual monitors that you see when spinning your head via accelerometer. Mode 1 is good, mode 2 is glitchy. I couldn’t use mode 2 for anything real.
Living in a rural area and visiting cities beats living in a city and viting the mountains for me. Visiting cities is super simple, and time of the year or weather basically doesn't matter. But for the mountains you need to be there to be ready for the best weather and conditions.
That’s so cool, I have been looking around for something similar but in Ruby. Couldn’t find anything, just a talk about the possibility of implementing it.
Both POV here can be reconciled with an experience-dependent exploitation-exploration tradeoff.

For everyone,

Eg., suppose t is the reward for exploitation, and r for exploration, and xp is your experience.

Then as xp -> inf, t -> inf and r ->0.

As xp -> 0, the reverse happens: t -> 0 and r -> inf.
Let's see what shows up :) Pressings can be wildly different. Also: beware of reissues, it was reissued several times.
We already have gravity batteries. They're called hydro-electric dams.
The state of ‘carbon dioxide removal’ in seven charts
I'm on HN since ~2008. Here's why I think HN Works:

+ Pure text based interface.
+ No flashy colors.
+ Blazing fast.
+ No notifications
+ Great moderation by @Dang
+ People just value the quality of the comments regardless who wrote them.
+ Most people focus on quality discussions, downvoting irrelevant fluff.
+ HN has it's own ethos around startups, nerdy things, programming etc.
Same here. Was flown out to Google to pick them up. It was an awesome product, for hardly any of my use cases. But I could see where certain industries or applications they would excel at.
In my city there is an incineration plant which produces about 94 GWh of electricity a year, covering 11% of city's needs.
Since I haven't seen many discrete maths books, he's my list:

Beginner: NL Biggs, Discrete Mathematics, Oxford University Press

Intermediate: PJ Cameron, Combinatorics: Topics, Techniques, Algorithms, Cambridge University Press

Advanced: JH van Lint & RM Wilson, A Course in Combinatorics, Cambridge University Press
I believe these are the AR glasses, not the mixed-reality headset supposedly coming this year.
It seems pretty common.

My spouse was considering applying to the Air Force almost 20 years ago (for the language learning school), and got the recruiter very excited after demonstrating excellent scores on the ASVAB... then it all fell apart after they answered some questions honestly about past depression and refused to lie about it on the forms as the recruiter wanted them to.
The multilayered approach is something we also do in one area, but at a certain point you are still playing dangerous games with the filesystem.

The most recent innovation for us is to use a lot of smaller SQLite databases, each scoped to a specific customer, session or unit of work. This is still far superior to loose records on disk, but you also get clear separation and reasonable firewalls between system entities.
Others have poked holes in the general line of thought here, so I won’t repeat their points. But also, the uptime for these services seems really quite good. I mean an outage is rare enough that it makes national news. Imagine if they’d hosted on any of the big corporate cloud services with billions of dollars to throw at infrastructure — they would have had multiple outages during our lifetimes just based on their provider doing down.