skysight-inc/HackerNews huggingface dataset:
Yep, and as you quote "Support for reloading C# is planned for a future release."

On the standard .NET Framework, edit-and-continue has been a thing during the last couple of years.

I rather have the maturity of .NET eco-system, than the uncertainty of the young Dart one.
The Best Social Media Management Tools in 2018
That's why I wrote "bluffing." If he is the shorts will come out way ahead as tesla goes below 200.
USDJPY: Still Retains Upside Pressure
It depends on whether or not someone is able to demand delivery at that price and what other forces are in play. i.e. presumably there are regulatory requirements that some minimal amount of capacity must be available as generators typically can't quickly spin up based on the whims of the sun/wind... but what if the generator provides it and there are no takers which a zero/negative price would indicate? Of course that's not sustainable for long it becomes a persistent situation: at some point the generator must be subsidized, or can absorb a loss over brief periods for the 'privilege' of being a provider the rest of the time, or goes bankrupt.

Running parts of businesses at a loss isn't unheard of provided the governments responsible for overseeing it are OK with and/or mandate it (a wide variety of services to rural customers here in the U.S. comes to mind) and the impacted business makes up for the loss elsewhere.
> Enron

"Quien se quemó con leche, ve una vaca y llora."

It can seem weird to have an excess of power availability, but it's a consequence of electric power not being easily stored -- electricity is just a good energy _transmission_ system. While using electrostatics (batteries) is possible for storing very small amonts of energy, when you think at a state or country scale, it's just too much to store.

This means excess energy must be either immediately consumed, or transformed in order to store it. The most common storage system would be gravity -- build a pump right besides your dam, and pump water upstream so you can use it later when power is not readily available. There are already some reservoirs using this -- at least one in Wales and I've recently read they'd like to build one in Hoover Dam. It's not simple though, because usually water is left to fall yet another bit right after the dam, so a second reservoir right below the dam would be needed.

So, what does a negative price mean. As the article puts it, its a signal from the grid that it has no use for your energy, _right now_, as there's an excess of generation. But if untapped, wind and solar will be just lost, so why not offer it to the users.

As renewables continue to grow, probably more storages will get built that can buy that excess and this anomaly will cease.
Ask HN: How to find contract work in Bay Area?
I have over 6 years of experience in iOS and I think i am pretty good programmer. I am looking for hourly rate of $200+ in Bay Area.
I get calls from companies that do placements but they don't go above $80 (even for Bay Area).

What can I do to get this rate?
Yes, depending on the timescale considered, the utilization factor of the plant should be weighed against the utilization factor of flood energy. In the long run it should pay itself back.
I'm not qualified to make a diagnosis of any kind, but this at first glance suggests that he's a narcissist.
I was a backend/cli developer for Dart, most of us were ignored when we asked for support in helping build out the Node.js aspect of Dart. So many left. I still maintain my few libraries but I lost of a lot of interest when they went full throttle on frontend only until it failed.

I hope Flutter restores some popularity. If it does, those libraries will start getting updated.
>Also California isn't most expensive, seems pretty much the same as many blue states. https://www.eia.gov/electricity/state/

>Data for 2016

This lists California at $0.15/kWh. I've never paid even close to that anywhere I've lived.

The current PGE residential rate of $0.28/kWh [0] is about the same as Honolulu, Hawaii, where 100% of electricity is produced from burning natural gas and petroleum.[1]

[0] https://www.pge.com/tariffs/electric.shtml

[1] https://www.hawaiianelectric.com/billing-and-payment/rates-a...
Dancing Pigs or Externalities? Measuring Rationality of Security Decisions [pdf]
> Wow! This is very elegant and general Prolog code, thank you for sharing it, and for your kind words!

Thank you! You're very kind but the credit goes to Manfred von Thun, he came up with Joy. And your book has helped a lot.

> Regarding the handling of ">" and "<", one possible alternative is to use constraint reification to reason about the truth values of arithmetic relations.

This is exactly what I wanted! Thank you. I'm just starting out with Prolog so it's difficult to know what to reach for, I spent twenty minutes looking for docs on "true" and "false" before realizing they weren't built in! Heh.

?- thun([dup, 0, >, [+], [-], branch], Si, So).

Si = [_9700, _9706|_9708],
So = [_9724|_9708],
_9700 in 1..sup,
_9724+_9700#=_9706 ;

Si = [_9800, _9806|_9808],
So = [_9824|_9808],
_9800 in inf..0,
_9800+_9806#=_9824 ;

false.

Awesome. (Both solutions, ta-daaa!)

Based on what you recommend about avoiding "defaulty" representations I've added a literal predicate:

thun( [Lit|E], Si, So) :- literal(Lit), thun(E, [Lit|Si], So).

literal([]).
literal([_|_]).
literal(I) :- number(I).
literal(true).
literal(false).

Right now I'm reading up on compiling and code generation, and your "Thinking in States" chapter is a big help.
Ah, cool, thanks :)
Yes, but we want the coal to be displaced. Not the nuclear.
As a point of reference, the Galileo navigation constellation apparently costs about 10bn (€ not $, but call it even): https://qz.com/1264365/brexit-is-breaking-up-galileo-europes...

That system is essentially a modern re-implementation of GPS, a known, proven technology.

To suggest that this untested, unproven, highly speculative solar shade project would cost the same is laughable to me. You're also totally discounting the unintended consequences and second-order effects of trying to engineer the climate.
We could, you can get a cheap bike for around $100, so making one available for everyone would be a small cost if we thought it'd be valuable.

However, that doesn't cover maintenance or getting a new one when the old is stolen. And it would not be a good bike to start with either, so most people would not want to use it, making it somewhat of an useless investment for society.

As a tourist in Berlin, the Mobike system was great. For just 8 EUR a month I could just grab a working bike, go where I want and just leave it outside. Then I could use the tram to go somewhere else, and use a new bike from the new place.

This without worrying about it getting stolen and being certain I'd find a working bike nearby when I need it. Making it very competetive with regular rental bikes.

I imagine that the low effort required makes it a good option to a free bike for many.

Maybe a subsidised rental bike system would make sense, to cover maintenance and administration but keeping the prices affordable? (I suspect the mobike pricing was some kind of campaign as it was quite low)
For sure!

Were the team members the main analyst on any notable investments? Bc you could list those companies to show they recognize value. Or maybe the amount of money raised by companies those analysts have reviewed? Not sure if that's how the analysis works, where the analyst is linked to a specific company.
If the drone sets itself to fire it will be very hard to identify anything on it (DNA denaturates after 60 seconds at 200 °C). The problem about off–the-shelf components is exactly that they can rarely be traced back to a particular seller and could even be salvaged from stolen junk etc.
I think this is the real reason not to build a hackintosh.

I don’t find the “theft” argument compelling, because Apple doesn’t even sell OSX anymore. They’re a hardware company.
You can still do the same on mac hardware though.
Hope it works out well :)
Wow, is that not the single best photo summing up the current state of affairs?! Straight out of a James Bond movie. It's got pallets full of poison, red Russian labeling, the cartoonish president himself! Can it get any more sinister?? I thought for sure that it must have been 'shopped!
Based on a few requests, I've added a key to the dungeon images.
Kiwi TCMS v5.2 – open source test case management
Production Is for Cattle, but Development Is for Pets
Short sellers aren't the only ones getting screwed. If you had taken a long position by buying call options with a strike price over $420, you're not gonna have a good time.

For example, the bids on $430 call options expiring in January and June 2019 were down ~20% and ~25%, respectively. If Elon's plan goes to fruition, those options can (probably) never be exercised.

The further out the expiry and the higher the strike, the worse it gets. Liquidity just evaporated, and the spreads are getting wider.
If you wait for power prices to be negative (or merely lower than usual) you are not getting an economic return on the money you put into the desalination plant when it is not running. Think about it, if you get a 100M Euros loan to make a desalination plant, how long will it take to pay that off if you only run your plant a few hours per day vs 24 hours per day. Whether it makes economic sense depends on the difference in power prices, the capacity factor, and the ratio to capital cost.

Germany has been attempting to make it work by turning the surplus electricity into hydrogen gas (and then maybe to something else, methane, diesel, ammonia, etc) by splitting water.
Do you host your own email server? If so, please go in depth about the setup!
I suspect the same thing. There's NEVER anything in this industry that is a coincidence. You might not get a lot of people agreeing with you right now, but just wait a few months and your comment will be spot on.
We have Harvard, MIT, plus, the Broad institute (and others), the network of Harvard teaching hospitals (Brigham & Women's, Boston Children's, Mass General, Dana Farbar), with their surrounding cluster of commercial and non-commercial labs, plus the VC infrastructure.
Something like this?

https://news.ycombinator.com/item?id=15304951
time to spin up some giant flywheels.
Deprecating it is a breaking change and would make migrating code more difficult. It's like how semicolons are allowed but rarely used in Ruby, Go, etc.

The style guide says to omit "new" [1], and our formatter can remove them for you [2], so the effect is that they are gone without the pain of a forced migration.

[1]: https://www.dartlang.org/guides/language/effective-dart/usag...

[2]: https://github.com/dart-lang/dart_style
Perhaps they need to use a phrase that rhymes (see discussion about using poems elsewhere in this thread).
I suspect it would be difficult to find an energy-intensive process with sufficiently low capital costs that it would make sense to only operate--recouping some of the costs--when energy rates are negative.
>closing jails, firing police officers, lowering ridiculous attorney fees, and shutting down county court complexes

How will it so any of these things? People will still be arrested and prosecuted for committing crimes. Its the incarceration vs alternative actions and programs that is being discussed here. Prisons would certainly be affected, but they aren't even in your list.

While it's true that prisons could be shut. Its also true that a whole new rehabilitation industry could spring up if alternatives to long term incarceration were enacted.
Fun idea, and some great tracks. Be cool to pause game and goto YT and hear the whole track.
I don't get it. If you are going to pave your own path, rejecting Apple ecosystem, then why not just be part of Linux ecosystem?

It probably takes less money and effort to simply buy a Linux laptop.
I am in exactly the same situation for at least 3 months now, every attempt to reset password failed.
That is the common excuse of C developers.

The goal of software security is to minimize all attack vectors.

Logic bugs < Logic bugs + Memory corruption bugs
Machine learning is basically the product that FaceBook actually sells. At the end of the day, they are an advertisement delivery service. They get paid based on user interaction with ads and sponsored content. The way they determine what ads to show to whom and when is all ML.

On the user side of things, they use it to suggest friends, detect/recognize faces in pictures, etc.
"You need to carry a majority of states in order to represent the states"

The states have never had an equal number of electors, so I believe your claim is false.
For instance, in California, it is now law that apartment renters can install EV charging stations (at their own cost). So even those who do not own a house can charge at home.
I wonder if a less efficient desalination plant would be cheaper. The modern efficient plants use RO with pressure exchangers, I think. Maybe a flash distillation plant or an RO plant without pressure exchangers would be economical to operate intermittently.

But desalination may be a poor example in general. It’s not actually very energy intensive, at least compared to the value of potable water in an urban location.
They are similar, but outside of small islands few people use oil for power generation due to the high cost compared to natural gas.
Natgas is a turbine engine directly; coal and oil uses a boiler running a steam turbine.
Neither of the alternatives you propose are what we currently have or are where we are currently heading (IMO). As long as we are speculating - I think a future with good storage tech and 100% solar+wind would be better than one with gas plants thrown in the mix. If climate change is as big a deal as people claim, than why would we sacrifice existing non-carbon-emitting capacity for natural gas? We don't currently have anything remotely resembling a largely renewable grid nor the technology to even accomplish it at scale.
Presidents of the United states of America and their UFO encounters
You wouldn't really be STUCK if you are blocked... you can just point your DNS to another IP (like 8.8.8.8 or something). This is DNS based, so if you don't use the Pi-hole DNS server, you aren't affected.
See Skydio As an example of a company doing this off the shelf already
Unfortunately it doesn't. Aluminum needs a lot of electricity, but it needs to be consistent for several hours. It takes a lot of energy true, but the furnaces need to be at operating temperature. You can't just turn them on and off, there are startup and cool down times that need to be accounted for.
> One proposed sunshade would be composed of 16 trillion small disks at the Sun-Earth L1 Lagrangian point, 1.5 million kilometers above Earth. Each disk is proposed to have a 0.6-meter diameter and a thickness of about 5 micrometers. The mass of each disk would be about a gram, adding up to a total of almost 20 million tonnes.

> Such a group of sunshades would need to occupy an area of about 3.8 million square kilometers if placed at the L1 point. The deployment of the flyers is an issue that requires new technology. Large railguns or coilguns are proposed to fire a capsule containing a million shades into space every 5 minutes for 10 years using 20 separate launch sites.

This is science fiction.
Or pay employees to work in open source?
In some cases, yes. I'm going to run this by some of the team and see where it lands.
I like the euphemism "power user" to refer to people who like to spend their free-time on meta-work.
No microecon background but I worked in an energy adjacent field for a while. One of the big issues here is that there is a huge price/cost mismatch. Consumers are billed a flat price at all times of the day and year (mostly), but the cost of producing 1 kWh of energy varies enormously throughout the day. This dynamic has always been true to some extent, but a huge increase in distributed solar generation has exacerbated this problem considerably in some places.

In most (all?) cases utilities cannot actually set their own price structures without sign off from regulators, so the onus is essentially entirely on utilities themselves to level out their costs (with storage or more flexible generation).
First example immediately reminded me of:

head -c 8 /dev/random | base64

I'm not a fan of doing everything through bash, but reaching for python just to get some random characters seems particularly bad.
I wonder if there's a way to remove CO2 from the air with surplus electricity without a half-billion dollar plant. That would be a win for everyone. It operates when the wholesale price of electicity drops below its threshold, perhaps only 4-6 hours per day, so would have to be a pretty cheap fixed cost.
Senior-citizen design challenges for startups
Generators are turned on/off via pricing signals, in advance a generator makes known how much money /MWh it will take for them to turn on and scale to various levels of output.

A control dispatch system monitors/estimates demand and sends pricing signals to the generators in an effort to match that demand. So reducing price when there's oversupply and increasing price when there's undersupply in an effort to balance load demand and generation supply.

Nuclear and coal plants produce a baseline output when they're on and take a long-time to turn on/off so their baseline bid is nearly zero. As long as they get a penny for a MWh they'll stay on because they make their profit in they high demand hours.

In a system without wind (solar is less of an issue because it's easier to predict) this design works fairly well at moderating power generation relative to demand.

Adding a renewable that's not properly predicted to this system for a few hours leads it to try to "turn off" some baseline generation if these hours are already low generation. If that baseline is priced close to zero then the pricing has to go negative.

Hope that makes sense.
Flash Memory Summit 2018, Micron Keynote Live Blog: QLC Flash
> scraping essentially requires creating an in-memory copy of this HTML

Just navigating to Facebook requires creating an in-memory copy of the HTML...
?? Detroit Techno is one of the original EDM genres. Like, 30 years ago. You can't get less obscure.
NG plants tend to use gas turbines, which can ramp very quickly indeed. Steam plants are a lot slower (thermal stresses and whatnot).

Very little electricity is produced with oil, BTW. Steam plants are usually coal or nuclear.
The cynic in me says the goal of making software controlled elections is to make them easier to manipulate. Given how insecure all these systems always are, I can’t believe the goal is improved security.
I know this was just an example of how they're different, but this particular feature should make EV chargers easier for the market to supply relative to gas stations.
>Just because something is clear to you doesn't mean it's clear to someone else.

Brushing the needless ad hominem aside, no, but things can also objectively be clear enough for everybody. Not everything is subjective...
they are, but they're usually considered "IT" It's a secondary role compared to science. The computational action is for math, stats, and informatics specialists (like computational genomics).

This often translates into lower status and lower pay.

You really need some chemistry and biology to get love in a biotech firm.
> Just because those companies have massive market caps and cash reserves doesn't mean they can cut a check for 40B+ to buy a company that is burning cash.

Cash reserves mean they can.

> Hard to imagine any board signing off on that deal.

Right, conservative (appropriately so!) corporate decision making means they likely won't, not can't.
The story of three envelopes is a business classic for dysfunctional organizations. It starts with an incoming manager replacing a recently fired outgoing manager. On his way out, the outgoing manager hands the new manager three envelopes and remarks, "when things get tough, open these one at a time."

About three months goes by and things start to get rough. The manager opens his drawer where he keeps the three envelopes and opens #1. It reads: "Blame your predecessor." So he does and it works like a charm.

Another three months passes and things are growing difficult again so the manger figures to try #2. It reads, "reorganize." Again, his predecessor's advice works like magic.

Finally, about nine months into the new job, things are getting really sticky. The manager figures it worked before, why not try again. So he opens the envelope drawer one last time and opens #3. It reads..."prepare three envelopes."

source: http://wikibon.org/wiki/v/Prepare_three_envelopes
This is an established ID verification process that is used by banks, financial institutions, etc... (assuming they integrated with a vendor, look at someone like Jumio).

Not speaking to anything else related to this at all, it does sound like they are quite a fly by night operation based on everything that is being dug up.

However, the technology mentioned above is not something they came up with themselves, and in fact see wide spread use for purposes of fraud prevention for financial systems (which sees active attacks against verification tools). Its not as easy to fool as you are making it seem.
Kids do that. The paint chips even have a sweetish taste to it.
This article is talking about unverified impostor accounts. This thread had _verified_ accounts that changed their name which is even more insidious.
No, it’s bad.
It's purely symbolic. A lease is still a contract between 2 parties. If one or both cease to exist so goes the lease.
I have at least 6. And we had 3 iPhones in this house.
Doesn’t work. By the time you’ve moved any non-negligible amount of ions, you’ve built up an insane amount of charge and hence voltage. That voltage will be impossible to work with, not to mention many orders of magnitude higher than the voltage needed to split water into H2 and O2.

One mole of singly charged ions is ~1e5 Coulombs. At an insanely high capacitance of 1 Farad (which you’ll never see in such an application) that’s 100kV of static charge by the time you move a few grams of salt.

This is why you essentially never encounter ions by themselves.
There are two major ways to do it at scale: Distillation, or reverse osmosis. In large plants they are actually energy competitive - reverse osmosis needs pumps to build pressure. Distillation needs energy to boil water, but then that steam is cooled down with the input water which gets heated in turn.

I'm not aware of any large scale ion plants, I don't know if the chemistry can work or not.
> due to the lower average revenue, it needs to be cheaper

It's unclear to me, but this may be tautological, or at least reversible (by being cheaper to be competitive, it reduces revenue). Perhaps I'm missing your point?

> There's no way to move your self-driving car to the opposite side of the world for the night.

Ah, but that's moot. Unlike with a human driver, an auto-car doesn't need to be moved to the opposite side of the world (or an approximation, like Sacramento from SF) for the night.

> If self-driving cars are cheaper, it seems like that would lead to more of them driving longer hours than humans, which would lower the utilization rather than increase it.

You're still confusing "driving" (in motion) with "on duty".

Also, even if an auto-car is cheaper while driving, that doesn't matter if the different parties are bearing the cost of off-meter driving. In the auto-car case, it's the vendor (e.g. Uber), so there's a strong incentive to maximize utilization. In the human case, it's the driver, so the vendor has no such incentive (nor even the ability during "on duty" but not driving-for-that-vendor times).
The “crapboards” are very much a case of YMMV. I much prefer the one on the new MBPs to the spongy abomination that is the current Thinkpad keyboard.
Could a similar technique be used for defense? Program hundreds of drones to track and collide with enemy drones at high speed?