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Storm drains are also not unusual in the UK, but they are often upgraded, newer systems. Here is a wiki article for Brighton, for example https://en.wikipedia.org/wiki/Brighton_sewers, mentioning a storm water collection system. However, they are apparently not entirely separated as overflow from sewer system can get into the storm system. In North America, many sewage and storm system are simply separate pipes as shown in exchemist's link.

I personally would NOT want the average parent weighing in on public education, or at least more than they're able to via representative government. Many of those parents want to drain the public coffers by removing their tax contributions to spend on private schools. Public education is supposed to be taking something that everyone benefits from and investing in it via non-profit processes to reduce costs, provide a tangible benefit to citizens, and provide a standardized curriculum to make sure we all start on the same page. Giving every parent the right of refusal for the knowledge their children receive from public education seems almost criminal to me. I see a LOT of potential for abuse by treating children as products and their parents as customers. How about we treat the children as young humans who need to be exposed to accumulated human knowledge, and less like some kind of profit potential? We're talking about PUBLIC schooling, where the focus should be on teaching rather than making a profit. The school isn't a factory, the students aren't the product, the parents aren't the customers. Public schooling is a contract between you, your child, and the government, who have promised to provide an education that allows people to participate in their own societies at the level they choose.

I'm not a fan of this idea. My mother taught English at A-level for many years in the UK state system and one of her perennial challenges was parents that had limited ideas about what was good for their children. She fought for years with parents who didn't want their daughters to go to university, or who wanted them to study something that led to an obvious job, rather than the subjects they enjoyed. If the parents choose what subjects to fund for their children, you would risk removing the ladder that lets children climb to reach their academic potential. Even in the UK private sector the school sets out the curriculum and the parents go along with it.

There's an explanation of the process for separating rainwater from sewage here: https://www.wavin.com/en-en/News-Cases/News/Pros-and-Cons-of-separating-rainwater-from-sewers-to-prevent-sewer-overflow-in-urban-areas From the description it does not look as if any country has really embraced this idea fully, though there seem to be some pilots at municipality level, Vancouver perhaps being one. It is evidently a very costly and disruptive exercise to retrofit a twin-pipe system, though I suppose it could be put in place on new housing developments if planning regulations were changed to require it.

I'm not sure what you mean by 'storm drains', espcially in London or the Thames Valley more generally. A good deal of rainwater finds its way to the highway drainage network, which is the responsibility of the Highway Authority. I'm not sure what car washes you mean individual prive drives or commercial car washing stations which will have interceptors and commercial disposal arrangements. As regards cars the main problem with them is the danger of inflammable petroleum products finding its way into the existing system and causing fires and/or explosions.Petrol Interceptors started to be introduced in the mid 1980s when a BS on the subject was published. I remember designing new highway drainage on new schemes in the 1990s + to include these.

I think it is a less a national, but more a municipal decision. There are many cities where storm drains are separate from household lines and therefore do not get to the wastewater treatment plants and are released into local waterbodies. You often see are bylaws that e.g. forbid to wash your car because the detergents can get into the storm drains, for example.

Your conclusions seem oddly rigid and unmalleable despite your repeated acknowledgements regarding just how little you've read or understand about what's actually happening here in each of the various cases. You seem to have an opinion in search of cherry-picked facts to bolster it instead of having a desire to understand and searching for verifiable sources to inform yourself. It's as if you prefer faith and believe that "my ignorance is just as good as your learning" is the best approach to comprehending these events. It's odd, really. Answers are readily available to these questions and details, and you're interacting with people who have taken the time to explore and better understand them... people who are willing to share what they've learned with you to help you be better informed.

Scenarios that don’t cause issues aren’t the arguments that point to the impossibility of FTL signals. One could probably contrive a large number of scenarios that used FTL and didn’t cause other problems

Thank you for making the use of this forum safer and easier for us all!

I have no skill here, but it's an idea. It seems like it would be possible to create a robo-mod, separate of the forum software, that would take whitelist or blacklist requests from a pinned thread. It probably will need to un-delete accidentally deleted threads. For security, run from any system or VirtualSystem or any network or 5Gbs/month hotspot. It only needs the scripts and the account password. It would navigate with the keyboard: Tab + Enter to navigate; arrows and Ctrl+C/V to copy/paste thread titles; Ctrl+Alt+T to open Ubuntu Terminal and then to paste posts or titles into Bash scripts, scripts which then decide whether to repeat the same macro or execute a new macro that will execute a new script, for example a script that deletes the second or third thread in All Activity after the top ones have been whitelisted. Possible hurdles: it will need the power to un-delete threads that are not whitelisted in time, or else it cannot run constantly and run on a whitelisting principle --it shouldn't accidentally delete a whitelisted thread if it doesn't have to reload the page, unless it isn't whitelisted in time--; it may need to ignore troll posts by simultaneously copying the username or user status and the user's posted content, which are in separate boxes; the robo-moderator would preferably have forum privileges limited to deleting or undeleting threads; OR ELSE, it needs a very clever algorithm for combining the lists via commands like Bash diff command; Ubuntu Terminal, which would take script prompts, only takes paste commands via mouse and not keyboard. *KEYBOARD NAVIGATION: mouse navigation would have to respond to differences in box size, but the keyboard can hit Tab 27 times or 27 + 5*Z number of times.

I'm a faddy eater and consume particular food types for a while then get bored, so if I stopped say cornflakes and went onto muesli, I bloat for a few days and burp/fart alot. I know it will pass in a few days when the gutflora has adapted to the new intake. One shouldn't immediately blame an emerging food type problem/allergy until you've given it some days. Like you do, it's better to vary within that food group for variety and you should still have an uncomplaining gastro-intestinal system. Obviously nut allergies and similar can't be dealt with like that, so I'm not suggesting one should try with those. I'm talking about general tummy upsets from indigestible stuff that gut flora work on.

Good morning. What subject are you studying this in, and at what level ? Is it General Science or something at higher level ? Muriatic acid is a very old name - in all the 60 years since I have known anything about it I have never seen the name used. So I will try to address other older conventions in my reply as well. The quantity of substances can be measured in several ways : weight, mass, volume (also called capacity) count (eg gram-moles) or pressure. Since the substances may be in any of the three normal states of matter (solid, liquid or gas), or the dissolved state some measures are more convenient than others. When you come to mixtures there is a comparison of more than one substance quantity and the units of measure can themselves be mixtures of the above listed measures. Common measures are weight per volume (w/v) ; volume per volume (v/v) ; weight per weight (w/w) ; and moles per volume (mol/litre) So you should look carefully at the labels for one of the above abbreviations on the labels you are told to read. Without this information you cannot answer the question. When it comes to percentages, unfortunately different industries use the % in different ways so my preamble is important. Here are two different listings for 18% HCl - one is w/w the other is v/v Either way the % is a fraction of the total amount - which is the sum of the water and the HCl in a given mass or volume Your 18 % Hydrochloric acid is a common cleaning concentration in engineering and often refers to what is called the mass fraction - a w/w measure. It means that of the total mass, 18% is HCl and the rest is water. So Mw is the mass of water and MHCl is the mass of HCl then [math]\frac{{18}}{{100}} = \frac{{{M_w}}}{{{M_w} + {M_{HCl}}}}[/math] or [math]\frac{{18}}{{100}} = \frac{{{V_w}}}{{{V_w} + {V_{HCl}}}}[/math] for the volume fraction You should be able to solve this for the mass of water. Does this help ?