John Cuthber

Those trees are almost certainly grown from cuttings. The word "heirloom" in this context means that they are a very old variety. https://en.wikipedia.org/wiki/Heirloom_plant

I think it was assessed here And the consensus was that it's crazy. I don't think there has been any improvement since.

To a good approximation, weigh the jack. Find jacks of similar design on the net and then look for one that weighs the same.

I'm pretty sure someone has the maths for things with a smooth change in refractive index. https://en.wikipedia.org/wiki/Gradient-index_optics

I did not say that no effect exists. I said that if there was a big effect, we would know about it.

If you didn't allow any people near the robot, you wouldn't need to worry about them saying "stop". A policy which may have other benefits... In this situation, you could use a passive IR sensor like they use in burglar alarms. If there is a person in the room, you shut down the robot.

Is that why you answered a post on double displacement reactions without there being anything related to double displacement reactions in your reply?

If your batteries are nearly on fire you will get some H2S. The academic book doesn't seem to mention batteries. I'm reminded of the story of the Kursk, where the official news said lots of things...

That does not make much sense.

That's not true. It is considered as a risk factor in humans https://en.wikipedia.org/wiki/Metronidazole says "In 2016 metronidazole was listed by the U.S. National Toxicology Program (NTP) as reasonably anticipated to be a human carcinogen." and "Metronidazole is listed as a possible carcinogen according to the World Health Organization (WHO) International Agency for Research on Cancer (IARC)" It plainly is considered to be a cancer risk. Similarly Says who? That paper is from 2018 by which time MTZ had been listed as a carcinogen for 2 years or so. Is anyone saying it's not carcinogenic?

No.

The National Trust is responsible for some bits.

I do, and it's not just me. https://www.keele.ac.uk/sustainable-futures/ourchallengethemes/providingcleanenergyreducingcarbonemissions/hydeploy/ We use billions of tons of natural gas each year. Mining "between 6 million and 250 million metric tons of hydrogen" isn't much use.

We use something of the order of billions of tons of natural gas each year. Taking the geometric mean of their estimates means that known hydrogen reserves would run out sometime between Xmas and Easter if we used them at the same rate.

I wonder if people engaged in this know what the death tolls on each side look like. This may clarify it (It obviously only includes civilians) https://countingthekids.org/?fbclid=IwAR0rsRw5R5C0yBNhvKy7_eHdasFiJpkJ0J1L85h8BIKvkKgHyhzLgI2py-4

Is there any evidence of that?

That's what the Tories did. They transferred planning responsibility to a cheat. https://www.insidehousing.co.uk/news/news/jenrick-steps-up-threat-to-council-with-ultimatum-over-local-plan---64679 Their man is "Going to build 5 new towns in the next couple of years to solve the housing crisis". How ? Probably better than the last guy built 40 hospitals https://www.theguardian.com/society/2023/jul/17/government-on-track-to-break-boris-johnsons-40-new-hospitals-promise

Derris is not DDT. https://en.wikipedia.org/wiki/Derris It contains https://en.wikipedia.org/wiki/Rotenone Which is often up forward by environmentalists as "good". "Soil Association standards allow organic farmers restricted use of seven nonsynthetic pesticides that have been approved on the basis of their origin, environmental impact and potential to persist as residues. They are copper ammonium carbonate; copper sulphate; copper oxychloride; sulphur; pyrethrum; soft soap and derris (rotenone)." From https://www.soilassociation.org/media/4920/policy_report_2001_organic_farming_food_quality_human_health.pdf It's associated with parkinsonism. https://en.wikipedia.org/wiki/Rotenone#Parkinson's_disease

We used to rely on mulching, hand weeding and "bio controls"- whatever they may be. They weren't good enough. That's why we started using weedkillers. Glyphosate may be carcinogenic, but so is alcohol and that doesn't stop people using it. It's a risk/ benefit question. Only presenting the risks is dishonest.

It's a commonplace observation that "if you drop a knife, you should let the floor catch it". If that's an option, it can't be a reflex- they are fast but unsophisticated.

Here's what you said, and what you said it in response to. You asked what does it have to do with escape velocity and I explained why part of it has something to do with escape velocity. I said "The escape velocity isn't strictly relevant, but it's a proxy for gravitational energy." And you ignored that and focussed on this bit. "If you don't fire retro rockets to slow it down, it hits the sun." Repeating your unproven assertion that you can't put something in orbit near the sun- well, in reality it depends in how near you get- but that's beside the point. But the answer to "so what?" is still that escape velocity- or gravitational potential energy- is important to the idea of putting something in orbit round the sun (As Halc said)- even if the thing melts. You brazenly ignored part of what Halc said and bolded part of it, didn't you?

Tell the site software. You did, in fact, say it. You were quoting Halc.

Yes

And so it won't end up in orbit round the sun. Had you forgotten what you were replying to? That's a convenient way to carry oxygen; but not a lightweight option. Why wait for an emergency? One of these will scrub out the CO2. https://en.wikipedia.org/wiki/Rebreather_diving But they aren't easy to work with. These are even more scary. https://en.wikipedia.org/wiki/Potassium_superoxide#Applications And we know what happens if you mess up an oxygen generator of that sort in water. "Analysts concluded that 23 sailors took refuge in the small ninth compartment and survived for more than six hours. When oxygen ran low, they attempted to replace a potassium superoxide chemical oxygen cartridge, but it fell into the oily sea water and exploded on contact. The resulting fire killed several crew members and triggered a flash fire that consumed the remaining oxygen, suffocating the remaining survivors." from https://en.wikipedia.org/wiki/Kursk_submarine_disaster

The escape velocity isn't strictly relevant, but it's a proxy for gravitational energy. Essentially you "drop" your spacecraft towards the sun and it accelerates as it goes. If you don't fire retro rockets to slow it down, it hits the sun. It takes pretty much as much fuel to get something "down" as it does "up". What's the temperature at midnight? If you make sure your satellite rotates fairly fast you need to look at the average temperature, not the peak. There's a difference between "flying to Moon" and "flying to the moon". But... https://www.tripadvisor.co.uk/Hotel_Review-g5113909-d5113592-Reviews-The_Moon_Inn-Stoney_Middleton_Hope_Valley_Peak_District_National_Park_England.html