That depends heavily on the time of day and where in NYC you happen to be. I tried their "mytaxi" app and it is shite beyond belief. I couldn't even pay with it. It couldn't connect.
I cannot disagree with you more. Parents are more likely to understand their child and how they learn than any random stranger. In addition, a parent is more likely to want what is best for their child than that random stranger. There are parents of whom it is not true that they want what is best for their child and there are parents of whom it is not true that they understand their child and how they learn. But, if you are looking for the person who best understands a child chosen at random and who wants what is best for that child, you are more likely to find that person by finding their parent than by choosing one of their teachers at random.
However parents pressure teachers to teach a certain way and parents, except for those with rare educational knowledge, don't understand pedagogy. Parents are one of the groups of people who undermine teaching methods in the US.
The biggest problem isn't removing the salt, it is what to do with all the excess salt that remains. If you dump it back into the ocean, it wipes out all sea life in a large radius. It is pretty devastating.
I thought the biggest problem was violating the laws of thermodynamics. Salt water is at a lower entropy than separated water and salt. It takes energy to separate salt and water. We already know how to separate salt and water. Maybe this is more efficient?
You have described a number of the methods taught in good teaching methods. Individualized teaching, being able to judge progress without resorting to the insane testing we have today. Students learn from each other more than the teacher and this can be capitalized upon.
There are strong pressures for teachers to 'get with the program' as determined by parents, the school board, publishers, head teachers and NCLB or NCLBesq programs. Whatever the motivations of teachers, improving education needs addressing more broadly across the people working in schools and parents need to be barred from schools. My wife certainly got shit for running the class the way she chose until they found the class pass rate was shooting up, whereupon they grudgingly let her carry on, but were not happy with it.
She gave up in disgust in the end and opened a yarn store - where she teaches knitting and spinning and there isn't a parent or school board in sight.
The difference is that she has a PhD in education and knows all the pedagogy research.
No, the difference is that your wife is a good teacher. She has the PhD and knows all of that research because she is a good teacher and the subject interests her. Knowing all of the pedagogy research is not what makes her a good teacher (although it likely made her a better teacher faster than without that knowledge). If she was not already a good teacher the studies would not have made her a good teacher. This does not mean that people who are not good teachers cannot be taught to be good teachers, only that our education system does not do so (except by accident).
She was a teacher before she quit and went back to college to do a PhD. She taught during and after and did a lot of in service training (teaching teachers).
>This does not mean that people who are not good teachers cannot be taught to be good teachers
That's her opinion too, although it's hard to make it stick it seems, which is a study she did - Do they keep using better techniques after learning them? The answer was no - after a short period they go back to doing what they were doing before. There are many reasons for this.
>please precisely define a "correctly." [wikipedia.org]
My wife would be able to answer better, since she's the one who did the research and got the PhD, but following the guidance of the NCTM would be a start. That guidance is well based on sound pedagogy research and is universally ignored by schools, teachers and school districts at the cost of the students.
Some mathematics is certainly hard, but not at the level necessary for most engineering or passing school exams. At those levels, the mathematics is intrinsically simple, but is presented and learned in bizarrely complicated ways. One example - a US high school mathematics textbook by Stuart, sitting next to me (I went to school in the UK, so I didn't learn from that) that covers trigonometry in a chapter. That chapter doesn't have a picture of a triangle in a circle until the last page. The whole topic is done in terms of memorizing formulas without meaning. Socahtoa and apply this formula for that corner etc. There is no structural meaning conveyed. Trigonometry of that sort is entirely to do with the properties of right triangles in circles and graphically trivial to understand. It must have been torture for students who were not clued into the simple model of understanding it.
Calculus is perceived as being hard by some, but the concepts are simple and the practice comes down to a few rules that unlike the formula soup of badly taught trigonometry has a lot fewer formulas to remember. Pulling l'hopital's rule from nothing is unlikely to happen, but it's not hard to remember. 5 or 6 similar things and you are good.
Once you get past that, the 'advanced' mathematics turns into number theory and group theory and related thins where it's made of abstract algebras that look fancy on the page but are much simpler than the algebra you did in high school. Why they don't teach that before they teach algebra in the reals is beyond me.
Depends on the person. Myself, I had a lot of trouble with Wiener processes.
Just random walks with well defined statistical behavior. I'm very familiar with the theory right now because I'm writing a book that includes a chapter on random walks.
Has anyone actually walked out of a primary/secondary mathematics education with the feeling of being more competent in mathematics as more than just a false sense of understanding?
Maybe you had a US education? I felt ok with it and it served me well at college.
So, if you force people who are not good at math to do more of it, they will eventually figure out that they are not good at it and avoid it? Well, lets just do other things to force them into a field that they will not be good in. Anything but admit that there might actually be valid differences in the sexes.
No. If you teach people who haven't succeeded at mathematics with bad teaching methods, they continue to not succeed and learn to hate the topic.
My wife has taught mathematics at community college in the classes for the people who failed at school and need to pass for entry to some degree program. I.E. people who have already failed and understand that they can't do math and don't like it and don't want to be there. The difference is that she has a PhD in education and knows all the pedagogy research. Applying the well researched teaching methods, they all magically get it and all pass the class and enjoy it. Literally transforming a 10% pass rate for the class to a 95-100% pass rate.
Mathematics isn't hard if it's taught correctly. However it is rare that it is taught correctly. Especially at more basic levels where learning problem solving and better ways of seeing problems is much more important than learning procedure.
> So I would leave the write master in the backend and all the POS would have the inventory pretty much in real time on their local read node.
That's pretty much it. So the front end is instant response for the user. Events are timestamped. The back end recombines the data in order when they are attached (normally they are attached all the time) and the inventories are kept in sync. The wrinkle is that the front end stores running state to local disk as pickled data so it can run solo (detached from the back end) across power cycles. Works great for trade shows - you can run it on a laptop.
I can bring down the back end, upgrade the the OS, have a coffee, watch some Netflix and bring it back up again an no one notices.
Please tell me you are kidding, because if you are not you need to step away from the keyboard, and STAY away from the keyboard.
No, not kidding. Now please explain how you know enough about our system to even be able to know if it's a good idea or not?
The draw to tell people on the internet that they're doing it wrong seems to be very, very strong around here, even when armed with only a couple of paragraphs of information.
>So.. going to write your own reporting solution as well? I already have. The reporting code doesn't change to accommodate this. The interface to the data model doesn't change. You have heard of data abstraction before haven't you? If you mess with stored procedures, you're still tied to the nipple of a DB vendor's tit. If the business logic code access the DB through your own procedures written in in-application code, then it's easy to adjust to a different storage model.
>Or does management not need any reports? Well we own the company and so I write exactly the reports that we need. The accountant gets the transaction data in exactly the form they need to automatically reconcile with bank records. Apparently all her clients with the quickbooks tools can't do that.
>Any guidelines from regulators viz. your storage and ability to audit the data? Nope. Personal data isn't in the PoS (point of sale) system. Financial transaction stuff (credit card info, etc.) is in PCI-DSS compliant kit. That doesn't change. The PoS is about an efficient storefront (checking out purchases) and inventory management.
>Most modern RDBMS do have in-memory tables. SQL Server 2016 has them That's lovely, but I don't need an RDBMS. The properties of time series data (people buying things) allows a nice post hoc recombination at the back end and allows the front end (at checkouts) to carry on regardless if they lose contact with the back end, so no "The computers have gone down, we can't sell you this". It is all already in tables, then synced to the database on the server. The actual design change is to store transactions locally on disk - it's only a handful of bytes per transaction - in such a way that you can pull the plug and reboot the front end and have it carry on from the point it was switched off including the contents of the current transaction that was being input. This is not a hard problem, it just requires knowledge of designing sound transactions (in the computer sense) and you can formally prove they are right with tools like spin. I can't even start python database connector without a bunch of hacking on the platform.
> It even runs on Linux nowadays So does the existing PoS software, which I wrote and the staff like because I iterated the design with them in the loop. It exists explicitly because off the shelf solutions were slow and cumbersome.
>All in all I think if the application was critical, I'd take out a license for an off-the-shelf database that does this already. It is. It's the conduit through which we sell things. But it is based on a well polished bit of software that essentially bug free and keeps running year after year. I wouldn't risk commercially licensed software. What happens when it breaks, or it requires and os upgrade or it just goes out of fashion?
However the substance of my comment was to agree with the comment before which suggests that large data tools are no applicable to most situations and I have a situation that fits that hypothesis, where the transaction rate is 10s of thousands per years. There are no Petas involved. I wasn't requesting a lecture on how to run our business.
Don't apply for the job of DB admin, we aren't hiring.
1 glass of wine doesn't even use up your quiescent ADH levels. It is quickly metabolized. The third and fourth glasses are past the point that the metabolization rate is determined by the production rate of ADH and so stays around a lot longer.
Does this apply to those who turn red after drinking even a 1/2 glass of wine as well???
Asian glow? I suspect not, but I've never read a peer reviewed paper that addresses the issue, so I would be spouting bullshit if I claimed to know. I suspect not because that is caused by a lack of an enzyme to process a breakdown product and I've forgotten all the names and I'm not looking it up right now.
Slashdot Mirror
>There's not been any shortage of cabs in NYC
That depends heavily on the time of day and where in NYC you happen to be.
I tried their "mytaxi" app and it is shite beyond belief. I couldn't even pay with it. It couldn't connect.
The Lyft/Uber experience is so much better.
That was good. Thank you.
Then you must not be very important if the company can survive an entire month without you.
If I didn't take my vacation they would get to try surviving without me around at all.
No it wasn't.
parents need to be barred from schools
I cannot disagree with you more. Parents are more likely to understand their child and how they learn than any random stranger. In addition, a parent is more likely to want what is best for their child than that random stranger. There are parents of whom it is not true that they want what is best for their child and there are parents of whom it is not true that they understand their child and how they learn. But, if you are looking for the person who best understands a child chosen at random and who wants what is best for that child, you are more likely to find that person by finding their parent than by choosing one of their teachers at random.
However parents pressure teachers to teach a certain way and parents, except for those with rare educational knowledge, don't understand pedagogy. Parents are one of the groups of people who undermine teaching methods in the US.
pretty sure it's just C
Graphene is like Boost::C++ or something.
Scientist: Do you know what this means?
Nick: There'd be an *awful* lot of salt.
And some gold too.
Cowboy Neal is salty too.
Given that the salt came from the oceans, you could just dump it back into the sea.
The biggest problem isn't removing the salt, it is what to do with all the excess salt that remains. If you dump it back into the ocean, it wipes out all sea life in a large radius. It is pretty devastating.
I thought the biggest problem was violating the laws of thermodynamics. Salt water is at a lower entropy than separated water and salt. It takes energy to separate salt and water. We already know how to separate salt and water. Maybe this is more efficient?
You have described a number of the methods taught in good teaching methods. Individualized teaching, being able to judge progress without resorting to the insane testing we have today. Students learn from each other more than the teacher and this can be capitalized upon.
There are strong pressures for teachers to 'get with the program' as determined by parents, the school board, publishers, head teachers and NCLB or NCLBesq programs. Whatever the motivations of teachers, improving education needs addressing more broadly across the people working in schools and parents need to be barred from schools. My wife certainly got shit for running the class the way she chose until they found the class pass rate was shooting up, whereupon they grudgingly let her carry on, but were not happy with it.
She gave up in disgust in the end and opened a yarn store - where she teaches knitting and spinning and there isn't a parent or school board in sight.
so, there will be a queue? first pedantry, then grammar, then spelling, then punctuation...
That's just being persnickety.
The difference is that she has a PhD in education and knows all the pedagogy research.
No, the difference is that your wife is a good teacher. She has the PhD and knows all of that research because she is a good teacher and the subject interests her. Knowing all of the pedagogy research is not what makes her a good teacher (although it likely made her a better teacher faster than without that knowledge). If she was not already a good teacher the studies would not have made her a good teacher. This does not mean that people who are not good teachers cannot be taught to be good teachers, only that our education system does not do so (except by accident).
She was a teacher before she quit and went back to college to do a PhD. She taught during and after and did a lot of in service training (teaching teachers).
>This does not mean that people who are not good teachers cannot be taught to be good teachers
That's her opinion too, although it's hard to make it stick it seems, which is a study she did - Do they keep using better techniques after learning them? The answer was no - after a short period they go back to doing what they were doing before. There are many reasons for this.
>please precisely define a "correctly." [wikipedia.org]
My wife would be able to answer better, since she's the one who did the research and got the PhD, but following the guidance of the NCTM would be a start. That guidance is well based on sound pedagogy research and is universally ignored by schools, teachers and school districts at the cost of the students.
Some mathematics is certainly hard, but not at the level necessary for most engineering or passing school exams. At those levels, the mathematics is intrinsically simple, but is presented and learned in bizarrely complicated ways. One example - a US high school mathematics textbook by Stuart, sitting next to me (I went to school in the UK, so I didn't learn from that) that covers trigonometry in a chapter. That chapter doesn't have a picture of a triangle in a circle until the last page. The whole topic is done in terms of memorizing formulas without meaning. Socahtoa and apply this formula for that corner etc. There is no structural meaning conveyed. Trigonometry of that sort is entirely to do with the properties of right triangles in circles and graphically trivial to understand. It must have been torture for students who were not clued into the simple model of understanding it.
Calculus is perceived as being hard by some, but the concepts are simple and the practice comes down to a few rules that unlike the formula soup of badly taught trigonometry has a lot fewer formulas to remember. Pulling l'hopital's rule from nothing is unlikely to happen, but it's not hard to remember. 5 or 6 similar things and you are good.
Once you get past that, the 'advanced' mathematics turns into number theory and group theory and related thins where it's made of abstract algebras that look fancy on the page but are much simpler than the algebra you did in high school. Why they don't teach that before they teach algebra in the reals is beyond me.
Which bit is hard?
Depends on the person. Myself, I had a lot of trouble with Wiener processes.
Just random walks with well defined statistical behavior. I'm very familiar with the theory right now because I'm writing a book that includes a chapter on random walks.
Has anyone actually walked out of a primary/secondary mathematics education with the feeling of being more competent in mathematics as more than just a false sense of understanding?
Maybe you had a US education? I felt ok with it and it served me well at college.
Mathematics isn't hard if it's taught correctly
No, it's still hard, but a good teacher can teach you the basic stuff.
Which bit is hard?
So, if you force people who are not good at math to do more of it, they will eventually figure out that they are not good at it and avoid it? Well, lets just do other things to force them into a field that they will not be good in. Anything but admit that there might actually be valid differences in the sexes.
No. If you teach people who haven't succeeded at mathematics with bad teaching methods, they continue to not succeed and learn to hate the topic.
My wife has taught mathematics at community college in the classes for the people who failed at school and need to pass for entry to some degree program. I.E. people who have already failed and understand that they can't do math and don't like it and don't want to be there. The difference is that she has a PhD in education and knows all the pedagogy research. Applying the well researched teaching methods, they all magically get it and all pass the class and enjoy it. Literally transforming a 10% pass rate for the class to a 95-100% pass rate.
Mathematics isn't hard if it's taught correctly. However it is rare that it is taught correctly. Especially at more basic levels where learning problem solving and better ways of seeing problems is much more important than learning procedure.
> So I would leave the write master in the backend and all the POS would have the inventory pretty much in real time on their local read node.
That's pretty much it. So the front end is instant response for the user. Events are timestamped. The back end recombines the data in order when they are attached (normally they are attached all the time) and the inventories are kept in sync. The wrinkle is that the front end stores running state to local disk as pickled data so it can run solo (detached from the back end) across power cycles. Works great for trade shows - you can run it on a laptop.
I can bring down the back end, upgrade the the OS, have a coffee, watch some Netflix and bring it back up again an no one notices.
DRM or not, Netflix-in-a-browser is still a stupid idea.
Normal people don't hook up their PC tower or laptop to their big TV.
Normal people use a laptop or tablet these days to watch TV grandad.
Please tell me you are kidding, because if you are not you need to step away from the keyboard, and STAY away from the keyboard.
No, not kidding. Now please explain how you know enough about our system to even be able to know if it's a good idea or not?
The draw to tell people on the internet that they're doing it wrong seems to be very, very strong around here, even when armed with only a couple of paragraphs of information.
Some of the contributors are upset about the way that this license change is being pushed through. See
http://marc.info/?l=openbsd-tech&m=149028593819547
There's always going to be a difficult one looking for any angle to complain and obstruct.
>So.. going to write your own reporting solution as well?
I already have. The reporting code doesn't change to accommodate this. The interface to the data model doesn't change. You have heard of data abstraction before haven't you? If you mess with stored procedures, you're still tied to the nipple of a DB vendor's tit. If the business logic code access the DB through your own procedures written in in-application code, then it's easy to adjust to a different storage model.
>Or does management not need any reports?
Well we own the company and so I write exactly the reports that we need. The accountant gets the transaction data in exactly the form they need to automatically reconcile with bank records. Apparently all her clients with the quickbooks tools can't do that.
>Any guidelines from regulators viz. your storage and ability to audit the data?
Nope. Personal data isn't in the PoS (point of sale) system. Financial transaction stuff (credit card info, etc.) is in PCI-DSS compliant kit. That doesn't change. The PoS is about an efficient storefront (checking out purchases) and inventory management.
>Most modern RDBMS do have in-memory tables. SQL Server 2016 has them
That's lovely, but I don't need an RDBMS. The properties of time series data (people buying things) allows a nice post hoc recombination at the back end and allows the front end (at checkouts) to carry on regardless if they lose contact with the back end, so no "The computers have gone down, we can't sell you this". It is all already in tables, then synced to the database on the server. The actual design change is to store transactions locally on disk - it's only a handful of bytes per transaction - in such a way that you can pull the plug and reboot the front end and have it carry on from the point it was switched off including the contents of the current transaction that was being input. This is not a hard problem, it just requires knowledge of designing sound transactions (in the computer sense) and you can formally prove they are right with tools like spin. I can't even start python database connector without a bunch of hacking on the platform.
> It even runs on Linux nowadays
So does the existing PoS software, which I wrote and the staff like because I iterated the design with them in the loop. It exists explicitly because off the shelf solutions were slow and cumbersome.
>All in all I think if the application was critical, I'd take out a license for an off-the-shelf database that does this already.
It is. It's the conduit through which we sell things. But it is based on a well polished bit of software that essentially bug free and keeps running year after year. I wouldn't risk commercially licensed software. What happens when it breaks, or it requires and os upgrade or it just goes out of fashion?
However the substance of my comment was to agree with the comment before which suggests that large data tools are no applicable to most situations and I have a situation that fits that hypothesis, where the transaction rate is 10s of thousands per years. There are no Petas involved. I wasn't requesting a lecture on how to run our business.
Don't apply for the job of DB admin, we aren't hiring.
>in my opinion the vast majority of use cases warrant for a traditional RDMBS
For my store PoS I'm working on dropping the Postgress backend and holding all the tables in memory. RAM grew faster than my tables did.
>For instance you could have petabytes of data in CSV format stored on your HDFS cluster
And somewhere in a tiny sub-corner of those petabytes, someone generated the CSV with Excel and the quoting is all messed up.
Actually, that's probably what OP was referring to: ADH - Alcohol dehydrogenase
That's what I'm thinking too, but I don't actually know. I'd have to go an read up on it. Where's a biochemist when you need one?