John Cuthber

Reminds me of this.

Iodometric titration, but I can't see how that's relevant. It's a chemical. It is always the same. Fundamentally, the material you posted the data for is just bleach. I think the amine oxide is there as a surfactant/ thickener. The other alkalies are there because hypochlorite is more stable in alkaline solution. What are you trying to achieve?

Really? This whole thread seems to be full of speculations and errors.

I don't think you can get high purity sodium hypochlorite as a solid powder- it usually decomposes a bit when you remove the water.

There are two problems with that. The first is that's not how testing works. If you are lucky, it goes like this: A study of a hundred patients would probably tell you about an effect that happened in 10% of them, but might miss an effect that happened in 1% of them. If you raise the sample size to a million, you will almost certainly spot any side effect that happens in 0.01% of teh population. So, at best, if you have a big enough cohort, you can detect an adverse effect that is very rare. But if the effect is rare enough, you may never be able to get a large enough test pool. If you are unlucky, you find something like this; the drug raises the lifetime cancer risk from about 30% (or whatever it is) to 30.1%. You need a huge, well designed study to find an effect like that. Such trials are expensive And here's the big problem with your suggestion. What do you do with the result? The people prescribing metronidazole know it's associated with a small risk of harm from cancer. But they are using it to treat a condition with a relatively large risk of harm. Actually putting a number on the first risk- say it's a 0.1234% higher relative risk- does not change clinical practice. So you would end up spending a lot of money to confirm something which the doctors already know, and already act on. Now, if you personally are a billionaire and want to waste your money on such a programme, that's your choice. But I suspect the rest of us would prefer the healthcare industry to spend its limited resources on things where the outcome will actually make a difference. Don't you agree?

For what it's worth, we were using lead lined coffins long before we had discovered radioactivity. https://gizmodo.com/workers-discover-700-year-old-lead-coffin-beneath-notre-1848660870 Lead is watertight. (well... we can call it "water".) A zinc lined lead coffin (once it's occupied) is an electrolytic cell to generate hydrogen. That's... not what I'd have done.

Actually, we now know that all spiders are radioactive.

Thanks Phi. Just in case any republicans think the video is absurdly far-fetched. https://www.telegraph.co.uk/news/2016/04/14/ted-cruzs-doomed-war-on-sex-toys-and-masturbation/ And that's from the Telegraph which is definitely Right-leaning.

Is there a version I can see without signing up for Twitter?

No Except, I guess, saying "50%" can only be wrong by +/- 50%

We still do sometimes; it's very effective.

I should have mentioned x-rays too. The carcinogenicity (and other risks) of metronidazole are still under investigation- as are those with any other drugs in medical use. https://yellowcard.mhra.gov.uk/

Very easy. A can of compressed hydrogen with a catalyst would be a better weapon than a water supply.

Fat cows bend in angles. The one I learned for the lanthanides would no longer be considered acceptable in polite conversation. Incidentally, "tetrel" is a new one for me. When was that coined? That means we have the noble gases, the alkali metals, the halogens, the alkaline earths, the chalcogens, the pnictogens , the tetrels and "the boron group" The trivalent ones need better PR.

English as a second language? There is no such thing as "American English". There is English; and there are mistakes. I suspect that a large part of the actual answer to the original question is a fall in the expenditure on education. Yes they do. It means "change" not "improve"

Hypochlorite bleach definitely expires. Also, are you aware of this sort of thing? https://www.rd.com/list/beauty-products-packaging-symbols/

What's special about cancer? Plenty of drugs have a variety of ways of killing you. https://bnf.nice.org.uk/drugs/metronidazole/#side-effects And you need to balance the risk of side effects with the risks of not taking the medication.

Alcohol, sunlight, silica and the fumes from diesel engines are known human carcinogens. Do you suggest that we ban them? Or do you think we should consider the benefits as well?

It's a lot easier to ask their next of kin...

No, it's not. Submarines get squashed to a measurable degree- some would say an alarming extent- even when they are working properly. I suspect he did it because he enjoyed it. It will if it leaks at all. Is there any point? Has anyone said the victims are not the "right" people? DNA will confirm the identities of any bits of body that they find. I guess that's useful in terms of labeling a coffin but I imagine the victims will be considered "lost at sea". Anyway, I predict further empty speculation.

I see another problem. Why poison woodlice for fun?

About 12 seconds into the video, they guy explains that he says you should keep your cards in sight- which is sensible advice. But it has nothing to do with RFID, has it? If someone has your card, it's no longer in the "protective" wallet. Why did you post that video in this thread?

Nor do you. Which means that, if Sensei isn't smart, nor are you. Past evidence suggests that he's smarter than you are. And, in any event, he's right about this.

Good question. How do you intend to maintain an air supply and a route back to the surface without it? Or did you not understand that it was implicit in the requirements I specified? They already started. https://en.wikipedia.org/wiki/List_of_spaceflight-related_accidents_and_incidents So he's just stating the obvious. Just a thought; If A kills B and is subsequently jailed for life for murder, is that a bad outcome? Actually, you sometimes can- as long as you make it 10 times thicker than it needs to be. For a one-off design, overdoing the glue makes more economic sense than building a clean-room etc. ... just as long as you get the sums correct. People seem to overlook teh fact that this sub dived successfully before. The problem wasn't raw strength, but fatigue resistance. To a very good approximation, nothing ever fails in straight compression. Failure of stability.... not very rare.

The bits that haven't already been tested by a million game players? It's a bit beside the point. The game-boy didn't include an "implode" function. In theory the only things that are "critical" are Maintaining air and getting back to the surface. They had at least one "get back to the surface" mechanism that was independent of that controller and the controller had nothing to do with the air supply.