IPv6 supports stateless IPv6 address assignment using SLAAC (StateLess Address AutoConfiguration). There is no need for a DHCP server. There are a number of reasons why using DHCPv6 to allocate individual addresses is a bad idea. If you've ever operated a DHCP server, you know about DHCP's failure modes, so I don't have to tell you. However, people get comfortable operating DHCP servers, and there's job security in it, so there are a lot of IPv4 old-timers who simply can't imagine a world without DHCP.
Speaking as one of the authors of RFC 3315, I think that Google is, if not right, at least not wrong. I would not personally want to have to set up a DHCPv6 server just to allocate individual IPv6 addresses. Talk about driving a nail with a sledgehammer. DHCPv6 is a great solution for the problem of configuring CPE routers with IPv6 prefixes. Addresses? Not so much.
This is a bit of a silly reduction ad absurdum. The problem with trans fats is that they are cheap and satisfying, and so they wind up in lots and lots of foods people eat, to the point that it's hard to find foods of that type that don't contain them, and you really have to care to find the difference. What this typically looks like is that poor people get foods that are high in trans fats, and well-off people get foods that are not, because poor people shop at price chopper, if they are lucky enough to have one they can get to, and well-off people shop at Whole Foods. And you see this very clearly when you look at health outcomes.
So it's not analogous to tobacco smoke, where the person consuming it has a choice. It's not analogous to chewing tobacco. It is related to fast food, because that's where you find the trans fats, but this actually makes choosing fast food healthier for you.
The point is that whether we make people who make risky health choices pay more or not, this actually eliminates a totally unnecessary health risk that nobody would choose to take on if they had a choice. And that can have a really serious effect on costs down the road, so it's economically a really smart thing to be doing, since health care costs are so high right now. But since it's a choice that can't be made at the point of purchase of the health care, it has to be done some other way, and this is a good way to do it.
Yup. I installed HSTS on my web site last week, and it worked a treat with both Chrome and Safari. I have to admit that I didn't test MSIE, due to a fundamental lack of Windows on my home network.
Yes, they really think they can protect against an MiTM attack. Of course it's possible that the NSA in cahoots with the aliens has a quantum computer that can MiTM any SSL connection, but even if they do, it's probably sufficiently expensive that they won't do it for every connection, but just for high-value connections. And if not, we're pretty fucked, because a big chunk of the world economy at this point depends on the notion that it is not trivially easy to MiTM SSL connections.
No, it doesn't show that. The point of the computer models is not to predict exactly how bad the outbreak will be. What good would that do? All you have to do to find out how bad the outbreak will be is wait. What computer models do is give us some kind of idea of how seriously we should take the situation. For that, the models did a fine job. They probably shouldn't have been bandied about so much on the news, but that's not a problem with the science--that's a problem with the science reporting, which is a well known problem.
But it's really, really frustrating when people predict a possible bad outcome and suggest steps be taken to prevent it, and then steps are taken, and then the bad outcome doesn't happen, possibly because the steps were taken (it's never possible to know for sure) and then somebody says "you cried wolf." No. Crying wolf is when you lie about a threat you know doesn't exist. The Y2K threat wasn't crying wolf, and this wasn't crying wolf. What both things were were attempts to mitigate a very real risk the severity of which was uncertain. The fact that we didn't have a massive breakdown in 2000, and that we didn't have an Ebola pandemic, are both really good outcomes.
Yup. Humidity is the one thing HRVs don't control well. Although I've found that strategic operation of the HRV can have a big impact on indoor humidity: turn it off at night if the house isn't full, for example, and you can ride over some high and low humidity events. But you have to be careful--forgetting and leaving it off for an extended period isn't a good idea, obviously.
Make sure your house has a decently sealed envelope, and use a heat recovery ventilator to ventilate it. Saves a ton on electric bills, and is more comfortable. Also make sure it's decently insulated, for the same reason. This probably seems pretty pedestrian, but it will make a much bigger difference in your daily life than gadgets. That said, we also wired our house for environmental monitors (temperature, humidity, air quality), and that has been kind of cool, and we have energy sensors on every circuit in the house so we can see what the house is drawing (also cool). But these things are more curiosities than actually useful, unfortunately. I do make routine use of the weather station we installed outside. And I wired the house for cat6e shielded, which will handle ten gigabit ethernet. I never use it, but in theory it's damned cool. I would like to have a doorbell cam down at the garage, but haven't gotten around to installing it yet. Fortunately that can be a retrofit.
Noah, what it is is simply a different service. I subscribe to Netflix because I can watch stuff I want to watch without having to sit through ads. Full stop. That's the service I'm buying. If Netflix starts pushing ads, they have stopped selling the service I want to buy. If they jack up the price without ads, and it's not an unreasonable hike, I'll pay it, because I like the current service. And you are wrong that ads aren't an inherently evil business model. They very much are: the point is to get you to do something that is against your interests. It's like when you ask a girl if she wants to go out with you, and she says no, and you keep asking her hoping she'll give in. Not cool.
More to the point, I would not pay for Netflix with ads. Netflix is quite reasonably priced at the moment. If they needed to charge more to avoid using ads, I would be okay with that. Of course they could charge sufficiently more that I wouldn't be okay with it, but I don't think they need to. The whole reason I use Netflix instead of TV is that I despise ads. HBO Now's advertising before each GoT episode really pisses me off, and makes me not want to use the service.
I hope you sized the wires right. Lower voltage means higher amperage, and while the math isn't quite this simple, the general rule of thumb is that you want the same gauge wire for the same amperage for 24v vs 115v. So if you use the 10a 115 volt wire for a 40a 24 volt circuit, you are likely creating a fire hazard if you actually draw that much power on the circuit. This is why 24 volt wiring is more expensive (in addition to economies of scale, of course). Losses for low voltage DC over longer runs are also quite significant. This is a factor even if you are using 110 for power and an AC-to-DC converter to run a string of LED lights: you need to make sure the supply lines for the lights are sized correctly.
So I think that you are actually putting your life at risk here if you are sizing your wires on the basis of watts rather than amps. I would recommend that you take a much closer look at this.
This is a load of hooey. Low-voltage wiring is a PITA, and losses due to conversion aren't as high as is being claimed. The loss from just charging the battery is bigger. I'm afraid we are stuck with 120/240 VAC, and Tesla is the winner.
Isn't it a little weird to say "I go to Mad Max movies..." as if there were some kind of continuum, when there are a total of four now over a period of 36 years, with the most recent one 30 years ago? This is just a movie. Like it or don't, go see it or don't, but the idea that you are going or not because of some habit you have with respect to your regular Mad Max viewing habits is just weird!
I think it's pretty interesting to see how successful the bible belt evangelical plan to get as many people out of the church as possible by espousing beliefs entirely contradictory to what Jesus said in the Bible has been. It just goes to show how effective a good propaganda campaign can be. The big boss is very pleased.
I'm not offended. I'm just correcting what swb said. The reality is that most well water doesn't have to be filtered for safety. In some places you need a radon bubbler to get the radon out of it, but for the most part the stuff is fine. When I was on well water in southeastern Arizona, we definitely filtered it, because it had a high sulfur content and didn't taste very good, but it was fine to drink.
We put those congresscritters there. The fact that we were bought by bread and circuses does not mean that the people who gave us the bread and circuses are at fault. This is why I bother getting into these arguments. The only people who have any power to change this are we, the citizens. Sure, it sucks that [name your favorite despotic billionaire] is trying to buy the election, but what they are actually buying are are votes. We need to learn how to stop letting them buy our votes, or nothing will change.
Your understanding is wrong. Reverse osmosis is used in places where the well water isn't safe to drink, but that's the exception, not the rule. Ever heard of the phrase "poisoning the well?" Used to be one of the worst war crimes there was.
Um. Have you ever heard of "natural spring water?" Mostly a marketing ploy, but it's based on the idea that water filtered down through hundreds of feet of rock is amazingly pure and good. I have been living on well water for the past four years, and it's the best water I've ever had. There is no need to filter it, because mother nature already took care of that. The idea that I could be obligated to add expensive post-processing to my well in order to render unsafe water safe is deeply offensive. You are proposing that it should be okay for some corporation to come in and fuck something that was really great, and then I have to pay to unfuck it to the point where it is not great, but merely not as toxic.
Where I come from we call that shitting where you eat, and we consider people who do it lower than a snake's belly.
Actually I would blame the regulator, and the regulations, and the congresscritters who voted for there not to be any. By the time the product reaches the final point of sale, we are powerless to discriminate between ethically-extracted and unethically-extracted fuels. The only way to get companies to behave ethically is to require that they behave ethically. This isn't because the people who run them are unethical bastards (maybe they are, maybe they aren't). It's because it's a commodity, and no producer can afford to do anything that costs more than what any other producer is doing, no matter how good their intentions.
To move the higher-priced ethically pure stuff to the customer the ethical producer would have to control the entire distribution chain, all the way to the customer. That's not as practical as it might sound. The major market for natural gas is in gas-fired generation, and those buyers then wholesale the electricity to the grid, and then we purchase it from our power company. So we are two or three steps removed from where we could vote with our wallet. We have no power to affect this market.
We customers of the grid are actually, a lot of us, paying a premium for clean power, but that power isn't coming from burning natural gas, because natural gas is not a clean source of power. So while we can reduce the total demand for natural gas, and we have, we aren't affecting the functioning of the natural gas market.
Because it's a commodity market, because producers really don't have any choice, the only way to make it possible for them to behave ethically is through regulation. Regulation prevents the race to the bottom: prevents the producers who would prefer to behave ethically from being forced to behave unethically in order to keep their prices at the same level as the producers who don't mind behaving unethically. This idea of just letting the market take care of it, and blaming the customer when they don't make choices they can't make, is futile and absurd.
How about a picture of a mountain, or food? Or if it's a face recognition class, then just some random ordinary-looking people in a public setting, rather than a model?
It's the face of a woman in a highly sexualized setting, arranged specifically to titillate. There's nothing wrong with this, and I agree that it's pretty mild compared to porn, but that's not the point. The point is that it presents a context in which hormone-fizzed young men (I've been there, I know!) will want to say something inappropriate, and some of them probably will. It doesn't make the young men bad people, but it can be pretty crappy for a young woman in that environment, and can even be unsafe for her, depending on the particular young men who happen to be in the class.
It should be dead obvious to any college instructor that this is inappropriate. She is absolutely right to call them out for it.
The Lena Rossi image is famous, but tossing it into a CS class with a bunch of eighteen-year-old men is just asking for a hostile work environment for any women in the class. The really sad thing is that the instructor is so in love with the old photo that he (I'm guessing) couldn't anticipate the problem and didn't come up with a better photo to use. That particular image is so low-resolution and has such poor colors that using it as a standard for doing CS instruction in 2015 would be stupid even if it weren't a problem in any other sense.
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IPv6 supports stateless IPv6 address assignment using SLAAC (StateLess Address AutoConfiguration). There is no need for a DHCP server. There are a number of reasons why using DHCPv6 to allocate individual addresses is a bad idea. If you've ever operated a DHCP server, you know about DHCP's failure modes, so I don't have to tell you. However, people get comfortable operating DHCP servers, and there's job security in it, so there are a lot of IPv4 old-timers who simply can't imagine a world without DHCP.
Speaking as one of the authors of RFC 3315, I think that Google is, if not right, at least not wrong. I would not personally want to have to set up a DHCPv6 server just to allocate individual IPv6 addresses. Talk about driving a nail with a sledgehammer. DHCPv6 is a great solution for the problem of configuring CPE routers with IPv6 prefixes. Addresses? Not so much.
This is a bit of a silly reduction ad absurdum. The problem with trans fats is that they are cheap and satisfying, and so they wind up in lots and lots of foods people eat, to the point that it's hard to find foods of that type that don't contain them, and you really have to care to find the difference. What this typically looks like is that poor people get foods that are high in trans fats, and well-off people get foods that are not, because poor people shop at price chopper, if they are lucky enough to have one they can get to, and well-off people shop at Whole Foods. And you see this very clearly when you look at health outcomes.
So it's not analogous to tobacco smoke, where the person consuming it has a choice. It's not analogous to chewing tobacco. It is related to fast food, because that's where you find the trans fats, but this actually makes choosing fast food healthier for you.
The point is that whether we make people who make risky health choices pay more or not, this actually eliminates a totally unnecessary health risk that nobody would choose to take on if they had a choice. And that can have a really serious effect on costs down the road, so it's economically a really smart thing to be doing, since health care costs are so high right now. But since it's a choice that can't be made at the point of purchase of the health care, it has to be done some other way, and this is a good way to do it.
China seems to be doing okay not in that role now. Being the leader isn't always the best thing--it can be more of a straitjacket than an advantage.
Yup. I installed HSTS on my web site last week, and it worked a treat with both Chrome and Safari. I have to admit that I didn't test MSIE, due to a fundamental lack of Windows on my home network.
Yes, they really think they can protect against an MiTM attack. Of course it's possible that the NSA in cahoots with the aliens has a quantum computer that can MiTM any SSL connection, but even if they do, it's probably sufficiently expensive that they won't do it for every connection, but just for high-value connections. And if not, we're pretty fucked, because a big chunk of the world economy at this point depends on the notion that it is not trivially easy to MiTM SSL connections.
No, it doesn't show that. The point of the computer models is not to predict exactly how bad the outbreak will be. What good would that do? All you have to do to find out how bad the outbreak will be is wait. What computer models do is give us some kind of idea of how seriously we should take the situation. For that, the models did a fine job. They probably shouldn't have been bandied about so much on the news, but that's not a problem with the science--that's a problem with the science reporting, which is a well known problem.
But it's really, really frustrating when people predict a possible bad outcome and suggest steps be taken to prevent it, and then steps are taken, and then the bad outcome doesn't happen, possibly because the steps were taken (it's never possible to know for sure) and then somebody says "you cried wolf." No. Crying wolf is when you lie about a threat you know doesn't exist. The Y2K threat wasn't crying wolf, and this wasn't crying wolf. What both things were were attempts to mitigate a very real risk the severity of which was uncertain. The fact that we didn't have a massive breakdown in 2000, and that we didn't have an Ebola pandemic, are both really good outcomes.
Yup. Humidity is the one thing HRVs don't control well. Although I've found that strategic operation of the HRV can have a big impact on indoor humidity: turn it off at night if the house isn't full, for example, and you can ride over some high and low humidity events. But you have to be careful--forgetting and leaving it off for an extended period isn't a good idea, obviously.
Ouch. Good point.
Make sure your house has a decently sealed envelope, and use a heat recovery ventilator to ventilate it. Saves a ton on electric bills, and is more comfortable. Also make sure it's decently insulated, for the same reason. This probably seems pretty pedestrian, but it will make a much bigger difference in your daily life than gadgets. That said, we also wired our house for environmental monitors (temperature, humidity, air quality), and that has been kind of cool, and we have energy sensors on every circuit in the house so we can see what the house is drawing (also cool). But these things are more curiosities than actually useful, unfortunately. I do make routine use of the weather station we installed outside. And I wired the house for cat6e shielded, which will handle ten gigabit ethernet. I never use it, but in theory it's damned cool. I would like to have a doorbell cam down at the garage, but haven't gotten around to installing it yet. Fortunately that can be a retrofit.
Noah, what it is is simply a different service. I subscribe to Netflix because I can watch stuff I want to watch without having to sit through ads. Full stop. That's the service I'm buying. If Netflix starts pushing ads, they have stopped selling the service I want to buy. If they jack up the price without ads, and it's not an unreasonable hike, I'll pay it, because I like the current service. And you are wrong that ads aren't an inherently evil business model. They very much are: the point is to get you to do something that is against your interests. It's like when you ask a girl if she wants to go out with you, and she says no, and you keep asking her hoping she'll give in. Not cool.
More to the point, I would not pay for Netflix with ads. Netflix is quite reasonably priced at the moment. If they needed to charge more to avoid using ads, I would be okay with that. Of course they could charge sufficiently more that I wouldn't be okay with it, but I don't think they need to. The whole reason I use Netflix instead of TV is that I despise ads. HBO Now's advertising before each GoT episode really pisses me off, and makes me not want to use the service.
I hope you sized the wires right. Lower voltage means higher amperage, and while the math isn't quite this simple, the general rule of thumb is that you want the same gauge wire for the same amperage for 24v vs 115v. So if you use the 10a 115 volt wire for a 40a 24 volt circuit, you are likely creating a fire hazard if you actually draw that much power on the circuit. This is why 24 volt wiring is more expensive (in addition to economies of scale, of course). Losses for low voltage DC over longer runs are also quite significant. This is a factor even if you are using 110 for power and an AC-to-DC converter to run a string of LED lights: you need to make sure the supply lines for the lights are sized correctly.
So I think that you are actually putting your life at risk here if you are sizing your wires on the basis of watts rather than amps. I would recommend that you take a much closer look at this.
This is a load of hooey. Low-voltage wiring is a PITA, and losses due to conversion aren't as high as is being claimed. The loss from just charging the battery is bigger. I'm afraid we are stuck with 120/240 VAC, and Tesla is the winner.
Sure, if you could only buy Entemann's poundcake a couple of times when you were a kid, and then later when you were a middle-aged adult.
Isn't it a little weird to say "I go to Mad Max movies..." as if there were some kind of continuum, when there are a total of four now over a period of 36 years, with the most recent one 30 years ago? This is just a movie. Like it or don't, go see it or don't, but the idea that you are going or not because of some habit you have with respect to your regular Mad Max viewing habits is just weird!
I think it's pretty interesting to see how successful the bible belt evangelical plan to get as many people out of the church as possible by espousing beliefs entirely contradictory to what Jesus said in the Bible has been. It just goes to show how effective a good propaganda campaign can be. The big boss is very pleased.
I'm not offended. I'm just correcting what swb said. The reality is that most well water doesn't have to be filtered for safety. In some places you need a radon bubbler to get the radon out of it, but for the most part the stuff is fine. When I was on well water in southeastern Arizona, we definitely filtered it, because it had a high sulfur content and didn't taste very good, but it was fine to drink.
Testify.
We put those congresscritters there. The fact that we were bought by bread and circuses does not mean that the people who gave us the bread and circuses are at fault. This is why I bother getting into these arguments. The only people who have any power to change this are we, the citizens. Sure, it sucks that [name your favorite despotic billionaire] is trying to buy the election, but what they are actually buying are are votes. We need to learn how to stop letting them buy our votes, or nothing will change.
Your understanding is wrong. Reverse osmosis is used in places where the well water isn't safe to drink, but that's the exception, not the rule. Ever heard of the phrase "poisoning the well?" Used to be one of the worst war crimes there was.
Um. Have you ever heard of "natural spring water?" Mostly a marketing ploy, but it's based on the idea that water filtered down through hundreds of feet of rock is amazingly pure and good. I have been living on well water for the past four years, and it's the best water I've ever had. There is no need to filter it, because mother nature already took care of that. The idea that I could be obligated to add expensive post-processing to my well in order to render unsafe water safe is deeply offensive. You are proposing that it should be okay for some corporation to come in and fuck something that was really great, and then I have to pay to unfuck it to the point where it is not great, but merely not as toxic.
Where I come from we call that shitting where you eat, and we consider people who do it lower than a snake's belly.
Actually I would blame the regulator, and the regulations, and the congresscritters who voted for there not to be any. By the time the product reaches the final point of sale, we are powerless to discriminate between ethically-extracted and unethically-extracted fuels. The only way to get companies to behave ethically is to require that they behave ethically. This isn't because the people who run them are unethical bastards (maybe they are, maybe they aren't). It's because it's a commodity, and no producer can afford to do anything that costs more than what any other producer is doing, no matter how good their intentions.
To move the higher-priced ethically pure stuff to the customer the ethical producer would have to control the entire distribution chain, all the way to the customer. That's not as practical as it might sound. The major market for natural gas is in gas-fired generation, and those buyers then wholesale the electricity to the grid, and then we purchase it from our power company. So we are two or three steps removed from where we could vote with our wallet. We have no power to affect this market.
We customers of the grid are actually, a lot of us, paying a premium for clean power, but that power isn't coming from burning natural gas, because natural gas is not a clean source of power. So while we can reduce the total demand for natural gas, and we have, we aren't affecting the functioning of the natural gas market.
Because it's a commodity market, because producers really don't have any choice, the only way to make it possible for them to behave ethically is through regulation. Regulation prevents the race to the bottom: prevents the producers who would prefer to behave ethically from being forced to behave unethically in order to keep their prices at the same level as the producers who don't mind behaving unethically. This idea of just letting the market take care of it, and blaming the customer when they don't make choices they can't make, is futile and absurd.
How about a picture of a mountain, or food? Or if it's a face recognition class, then just some random ordinary-looking people in a public setting, rather than a model?
It's the face of a woman in a highly sexualized setting, arranged specifically to titillate. There's nothing wrong with this, and I agree that it's pretty mild compared to porn, but that's not the point. The point is that it presents a context in which hormone-fizzed young men (I've been there, I know!) will want to say something inappropriate, and some of them probably will. It doesn't make the young men bad people, but it can be pretty crappy for a young woman in that environment, and can even be unsafe for her, depending on the particular young men who happen to be in the class.
It should be dead obvious to any college instructor that this is inappropriate. She is absolutely right to call them out for it.
The Lena Rossi image is famous, but tossing it into a CS class with a bunch of eighteen-year-old men is just asking for a hostile work environment for any women in the class. The really sad thing is that the instructor is so in love with the old photo that he (I'm guessing) couldn't anticipate the problem and didn't come up with a better photo to use. That particular image is so low-resolution and has such poor colors that using it as a standard for doing CS instruction in 2015 would be stupid even if it weren't a problem in any other sense.