skysight-inc/HackerNews huggingface dataset:
In modern educational parlance, this is "present, practice, produce". But it's missing the bloody present part. And the production.

A single worked example would save the student a lot of time.

Some educators like to say that students should be able to figure it all out for themselves. That students are better off not being taught. I guess it depends on the teacher - some teachers can add value.
You were only offered 3 weeks of vacation after 10 years of experience?

Is this common? What have I gotten myself in to?
I think everyone conceptualizes and encodes basic arithmetic stuff in their own way. Some memorize it symbolically, some visualize, some think of number lines, graphs and so on.

I've always had a tetris thing going on in my head.
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Another member of the "I wrote my own Emacs" club: Fabrice Bellard, of QEMU, TinyCC, FFMpeg, LZEXE...

http://bellard.org/qemacs/
I love that Jobs uses the "Sent from my iPhone" signature after all this time. So unnecessary.
As far as teaching children the facts of numbers, I've always liked Eliezer Yudkowsky's The Simple Truth:

http://yudkowsky.net/rational/the-simple-truth

Especially how it initially presents the concept as magic. Actually, maybe not a good way of explaining numbers to children. But I like the story nonetheless.
We can guess they want different groups of numbers that lead to the same sum (e.g. 7+4=12; 10+2=12) but this lesson clearly has context outside of the paper itself - that is, the teacher explained what to do, and these are exercises based around that. Without that context, we're just guessing what the goal is.
Sorry, I meant 7+5=12 - typo :)
Why even equals signs -- the arrow can just be read as "transform the lhs problem into the simpler rhs problem".
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If you compile from source as described here http://www.chromium.org/chromium-os/building-chromium-os at the end you can make a bootable USB drive.

I'm writing this on Chromium OS booted from a USB drive on an Acer AspireOne. Wifi and trackpad do not work but the rest is fine. Trying to find a way to switch to Dvorak.
While I agree that a lot of the griping is unwarranted and developers don't know how good they have it, you're wrong about them being the best. Danger (now Microsoft) had an amazing hiptop developer program that many people forget about.

Of course after their recent data-loss incident it's not that great of a developer platform, but up until then it was a better experience than the iPhone. Fewer eyeballs in the download catalog but also only a handful of developers, each of whom was always willing to help out another. Unlike the App Store with its 1000+ (10 000+?) developers out to make it rich quick.

Anyway the main problem it seems is a lot of desktop developers come to the mobile platform expecting the same process, this is wrong.
If you can't grasp conceptually why 8+3=11 then you should just memorize it.

You should memorize it either way.

Imagine if every time you looked at some basic arithmetic, you had to make the choice, am I going to take the time to figure this out and lose my train of thought, or am I going to gloss it over and move on? Imagine having to gloss over 8+3 as "some number in the lowish tens." You might know how to add 8 and 3 conceptually, but to actually work it out would take some extra effort.

Thus, memorization. It's highly underrated.
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Yes but mg has a powerful tool for software development.
Just try M-x theo. I find it quite motivating.
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That's a good point, but that doesn't make this assignment any less poorly crafted. It is common for parents to help their children with homework, and I would expect that to be taken into consideration when creating a worksheet that is less straight forward.

Even if the child knew what they were supposed to do, they'd have the explain the assignment to the parent... which they might explain incorrectly. Just another level of confusion.
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I have no idea what that legalese means (could someone translate?), but considering the poster is from New Zealand, it shouldn't be an issue.
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To play the role of devil's advocate, I can see what this assignment is trying to do. It's trying to teach that numbers (particularly discrete ones) are representations of a quantity, not just abstract symbols that follow some arbitrary set of rules. I wouldn't be suprised if the kids who successfully learned this way would have an advantage over the rote memorization kids if you were to stick them in a Discrete class 12 years later. As soon as I saw the grids, my mind was screaming "pigeonhole principle!" But that might just be because I have a combinatorics exam in 6 hours.
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Column #3 on Table 6, page 23 is the sum of: proved hydrocarbon reserves (from table #5) + undiscovered hydrocarbon reserves in BOE.
Great idea. YC funded such a company, find out where they failed and don't repeat their mistake.
You mentioned Kumon, and I felt a cold chill go up my spine from a long lost, forgotten childhood trauma. <nod/>

I was good at math, but my mother ran a Kumon center as her small business, and I had to do Kumon so that she could use me as an example. I felt sorry for those kids. In the end, I think the repetition method helped a lot of the students. But the style is so different from the American educational system that, from the perspective of someone who did fine in public school, the Kumon method just felt.. dirty. Like corporal punishment.
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Right. I personally think browser apps will become less relevant. The only reason people are using browser apps is that installation and management of applications on desktops has historically sucked very badly.

Install/Update/Uninstall is no longer a good metaphor. Something like iPhone App Store (but not managed by Apple like it is now) or Ubuntu/Debian-esque package management might be the future.
Agreed. The visual placement of the grid is a large part of the problem. You'd be able to discern the flow (and logic) of the assignment far better if the grid were placed in between the two sums, for example.
Column 3 of table 6 includes coal. Nobody disputes that including coal the US has the most hydrocarbons.

But the original statement was that the US has the most oil and nat gas. And that is not true and not shown by the document.

edit: hydrocarbons substituted for carbohydrates
Seriously if they are so hung up on undocumented API calls, they should just implement that check as part of the binary upload process. Run the binary through an automated flagging system. This will not only benefit developers but also cut their review time plus reduce the number of update submission indirectly.
Re: "Nobody disputes that including coal the US has the most carbohydrates."

Carbohydrates are what you eat for breakfast.
The code is free and open. Download it and port it to your platform of choice. You can't expect Apple to port their code to Linux for you.
Customer Development Past Present Future - Steve Blank
Ask HN: Fleeing work
I'm an American university student in a position to work with startup this summer with flexibility in location. I want to travel somewhere I've never been before and stay there for a month and work from there. A nice coastal town would be awesome (I love the sea). Any suggestions about a location? My requirements: high English-speaking population and broadband internet access. A strong dollar:local_currency ratio and cheap flight to/fro helps.

Some places I had in mind: Cape Town, South Africa; Cayman Islands.
Concept is solid. If you want to be taken seriously as a developer, make a splash as a developer; expecting attention for being a girl is counterproductive.

Execution needs work. Running girldeveloper.com does not immediately communicate to me that this is someone whose identity is invested in being a developer. Otherwise it'd be HaskellRocks.com or something.
Doh!

You're right. I should have read the whole article. This method uses volumetric instead of surface heat. While Blender uses surface heat. Actually, strictly speaking, Blender is closer to using surface glow instead of surface heat, or at least the version used internally at one of the companies I work with does.

I think this algorithm could probably use glow instead of heat as well. Then again, the article does not mention the method they use for calculating their weights, so it may effectively be glow and not heat. Which would make this algorithm probably the best out there in terms of results.

Or maybe they have a weighting factor that is better than glow or heat! Without more info we can't say. But I think we should definitely implement this volume diffusion architecture in Blender with a replaceable weighting factor so that people can experiment with which weight factor is best. I think that would be useful. Too bad 2.5 is so big. Maybe for 2.49-?
I'm guessing you're a straight white male. Imagine how different you'd feel, be perceived and interact at a sports bar almost only by White people versus night club almost exclusively attended by Black people.

It's uncomfortable to be in the extreme minority. That's one reason why many small liberal arts colleges actively pursue Black students, they know that a small minority population will further hamper recruitment efforts.
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Web-only may be enough for some consumers - but are those the same consumers that would buy such a device instead of an actual computer?

If it was a good bit cheaper than an actual computer, I'd say yes, exactly the same. It would also be a tempting target for makers of devices like the crunchpad, which basically attempted to implement their own version of such a thing.

A very good point about android though. It seems like it wouldn't be that hard to make them interoperate. Its a strange move on Google's part to so adamantly separate them. (Instead of perhaps extending android to do the work of chrome).
I'm sure part of the reason Apple isn't as keen to rapidly iterate its software is because it wants to keep its image of quality software up.

There are also some benefits to having a closed app store.
1) No viruses
2) Easy platform to collect payments
3) What else?
> The trouble with this comparative openness is that you end up with 800 pieces of software written by different companies fighting it out on your desktop, leading to crashes and inconsistent UIs all over the place.

And that's a bad thing because? Who has the mainstream OS now with over 87% market-share? Even popular cross-platform applications that were first available for Macs (like Adobe Photoshop) are now more optimized for Windows.

Microsoft has always been more open ... you can install Windows on any hardware you want as long as it's compatible (and most hardware is, with the notable exception of ARM-processors).

The developer tools where a lot more competitive because Microsoft allowed competition from the likes of Borland. And the Windows API was free to use (as opposed to OS/2 for instance). And for end-users ... Microsoft has always been committed to backwards compatibility (at least for popular applications).

Microsoft can be called "evil" yes, because of their aggressive tactics regarding competition. But imagine what would Apple do in the same position ... and it's kind of ironic that many developers choosing openness went to Apple for that.

Apple makes money, yes, but they were on the edge of bankruptcy ... they should've learned a valuable lesson then (besides keeping Steve Jobs as the CEO).
So the 2010 World Cup will be in Cape Town, South Africa. This means more expensive housing, depending on when my one month stay is I suppose.
"Coal is too expensive to transport for export". Seriously?

The United States exports over 60 million tons of coal each year.

"Good luck basing our economy on coal."

China is building one new coal fired power plant each week. The OECD projects China's economy to grow 8.3% this year -- while the rest of the world is mired in a recession. China's entire economy is based on coal.

Warren buffet just bet the entire future of Berkshire Hathaway, his life's work, on coal -- BNSF is the prime mover of US coal exports to China.

You really have no clue about hydrocarbons.
My sister worked at Kumon for a while.

For those folks here who don't know, they're a Japanese juku (cram school) which expanded to America mostly to service the children of Japanese parents abroad. (A common fear is that a student who spends a few years in an American public school prior to returning to Japan will be academically crippled.)

I have only two things to say about mathematics education in Japan: it works very well for students in the academic track, and it isn't considered strange to have girls say they like it. So the next time you hear someone saying how we need to address gender balance, there is your answer: soul crushing drills!
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Not that I care much, but what makes you think my comment is untrue?!
Apple employees have the advantage of being paid by Apple to work that way.
Not everyone who wants to make good stuff wants to get into business.
"Raw materials only drive economies when they are relatively small economies that can hitch themselves on larger consumer spending economies that are booming"

The United States' consumer-led economy isn't "booming".

"The problem with global recessions is that demand for everything tanks and that includes raw materials."

Have you checked the price of gold and oil recently? Those definitely _are_ booming :-)

"The so called "voracious appetite" of China is only voracious because they use it to feed the voracious appetite of America for consumer goods. If Americans keep getting poorer that appetite of China will no longer be voracious and raw materials prices will keep falling."

China's economy is expected to grow 8.3% this year, and raw materials prices are soaring. Believe me, I know :)

The only thing that's falling is the consumer-sector of the economy. The US economy is bifrucating between core industries and the consumer sector.

I think it's reasonable to expect that the consumer side of the US economy will contract dramatically from the 70% of economic activity that it currently represents -- it has to come more in-line with the rest of the world.

It's a fallacy to think that the consumer has to drive economic growth -- that's been a phenomenon unique to the US since WWII.
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No she doesn't. She's perfectly happy with the iPhone. Even if she envies the functionality on my HTC sometimes.

But the discussion here were HACKER phones, not consumer phones.
Long term, higher education is screwed. There's no real way to improve the efficiency of 1prof:10-100 students. Most attempts just result in an inferior product. Increasing productivity in all other areas means that professor and the resulting education gets more and more expensive (everything else gets cheaper in comparison).
"Customer Development-Past, Present, Future"
It's simply an enhancement to the way we use computers. But regular OSs will always have their place. I'm not sure it's so huge that it's what we will all migrate to though.
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After repeating enough times, eventually it will click and you'll understand it.

I fully agree. My parents like to tell this story about how I sucked at math and one day, at Disney World, there was a ride with cars going by. The cars had numbers on them and somehow seeing that made addition click in my head. I spent the rest of the day annoying by finding some sum for every number I saw in the park.
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Gosh, I had no idea that asking for investment online was so filled with red tape. Consider this a request for you to contact me for more details, and a great way to get thoughts on my site.

Also, I can rest in confidence knowing that I am NZ based.

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I wonder how many of those students voted in the last election.
Before giving this out, several identical questions would have been worked out in front of the class. So it's not a "figure this out from the worksheet" matter; it's a "recognize it's like the problems we did earlier".

It that context, it's a plausibly useful exercise; it's analogous to how I (still) total and multiply numbers in my head: determine the similar problem that gets to either a nice round number, or a memorized result -- then adjust for the remainder.
Ha. Real mathematicians start from axiomatic set theory.
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China's economy is based on what they do with the coal not on exporting coal. I.e., it is based on the goods they produce from factories that run on coal.

I guess I was wrong about coal exports, the US actually does export some coal, but the US economy or economic recovery cannot be based on coal. It currently fetches about $70 per metric ton, and it is only going to go down.

Warren Buffet made a bet that as oil prices go up things more valuable than coal will start getting moved on those railroads.

Oh and if you want a coal based economy you can see some pictures of those chinese cities where you cannot see 100 feet in front of your nose. Even China is trying to get off coal as quickly as it can.
I think there's a big space missing in learning to make web applications (this doesn't fill it). We often see material about the raw stuff (js,ajax,css), but we don't see material that focusses on HOW you should use that raw stuff. This is the most important part.

This course uses Rails, so I imagine you get a good overview of how you do stuff....but that's just how Rails says you should.

Does anyone have framework agnostic material that talks on a higher level about how we should be doing things?
maybe if either side was complete.
I agree. Being in the extreme minority means that you'll draw a lot of attention. That's great if you are an attention-seeker, but developers are often the precise opposite.
It is wishful thinking regarding that Microsoft has currently four (IE 6, 7, 8 and the compatibility mode) slightly different implementations, and this number will only increase with their development.

The real problem is that web standards of the past (made by W3C) were overly complicated and not practical, so the browser developers had to make engineering trade-offs to implement a subset of them. So in practical sense there is no such thing as standard compliance, and this is not something Microsoft can go with.
A lot of hackers go through the experience of being in a minority(1), the only difference is that it's not illegal to pick on the geeky kids hanging out in the labs.

The constant attempts in this community to segregate it into small groups of aggrieved protagonists drives me nuts sometimes. The mentality of us against us seems even dumber than the mentality of us against them. Better to just get on with building things.

(1) No more self selected than being gay, albeit easier to hide than being black.
Firstly, I agree with other contributors that memorization is under-rated, and agree that lots of memorization gives a basis of "instant knowledge" for when you are working on more difficult problems.

However, this is a pretty good way of learning a general principle. Take the first example, "8+3". Over on the right you have boxes in groups of 10, and the first box has eight "counters" filled in. Now you add three by filling in another three boxes. This gives you ten full boxes, and another one left over. Thus 8+3 goes to 10+1.

ADDED IN EDIT: Now that I think of it, how many of you simply ignored the instructions to fill counters in the boxes to help you, and tried to see what was going on just by looking at the numbers?

Of the three that you are adding, two are used to make the eight up to ten, so you only have one left. In a sense you've moved 2 from the 3 into the 8, making the sum easier. Moving stuff around in an addition is very similar to moving stuff around (and then making a correction) in multiplication. This is how Art Benjamin squares two and three digit numbers faster than you can punch them into a calculator.

53 squared is 53 times 53. Move three from one into the other (remember the 3 you've moved around) so you get 50 times 56. Use the same trick but in a different way: move a factor of two from the 56 into the 50 so you get 100 times 28, or 2800. Now add on the square of the three you moved earlier, giving 2809.

ADDED IN EDIT: How this works can be demonstrated clearly with an appropriate diagram.

If you're multiplying, moving factors is the same sort of operation (both multiplications) so you don't need a correction. If you move by addition/subtraction it's a different operation, so you will need a correction.

However, all of this fits into a larger framework. Getting only a small part lets you do those bits, but as it fits together you end up with more than just the parts, you get a much larger framework.

This is actually, tangentially, related to the item I submitted 10 hours ago and which sank without a trace:

http://news.ycombinator.com/item?id=951250

The same trick is used twice in two different context to give the Infinite Ramsey Theorem: Every infinite graph contains an infinite complete subgraph or an infinite null graph.

Very similar.
I have to agree with the author's faulting of esr's metaphors, but I'm not sure pyramids quite fits. Complex systems are tough. Thankfully, Yochai Benkler's now rather famous Coase's Penguin has a much lengthier technical analysis of how these sort of systems are organized: http://www.benkler.org/CoasesPenguin.html
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