I did look to see which site you were linking to, but must have missed that one. It used to be that Wikipedia didn't have articles for these, but as seems to be inevitable for such topics, Wikipedia grows and overtakes older pages in terms of breath and depth.
Still leaves me jealous of others, especially those that have been to Antarctica where some of these halos are a lot more common (plus it was warmer there last week). I still haven't seen anything beyond a 22 degree halo and sun dogs.
I've found this site quite useful for learning about and identifying halos. The site has both simulation images and frequent real images, explains the situation leading to halos, and mentions how rare some of them are. It even has a small section on halos on different planets where ice other than water ice would form different crystal shapes.
UV light doesn't quite light up what people expect based on cartoons and some TV shows. Some cleaning products can leave behind residues that will glow under a blacklight, including some that purposely add such things to help make things like cleaner and brighter in sunlight. And bodily fluids don't react much, with things like crime scene investigation spraying additional chemicals that will attach or react with the fluids and glow brightly. Cat urine is kind of strong compared to other biological stains though (and subject of really random trivia as result).
There are quite a few instructions around for making a setup to melt aluminum, including ones that use propane or even waste oil instead of charcoal to heat it. One of the best pieces of advice though is probably to have some sort of tab or hole on the crucible so you are picking it up in a way that doesn't depend on your grip, as you don't want to drop it and it can get heavy fast since metal will weigh more than something like water. The material can effect the longevity of the crucible too, as thin steel or steel with bad welding can rust faster at those temperatures.
Most of the comments on previous aluminum casters I've seen also high recommend avoiding using aluminum cans, as they tend to oxidize too much and get too much junk in the aluminum ingot that will weaken the casting, even with removing the dross. You can add various things to the aluminum to help impurities separate out, and having some aluminum from a different source to get a pool started can help if you are quick at melting the cans though. But instead I've heard of people watching curbs for things like broken lawn mowers that have a cast aluminum engine that can be broken down to give higher quality aluminum for projects.
Like a lot of things in cooking that involve getting a well cooked outside and lightly cooked inside, the size of baked goods don't just scale up and down proportionately. At the very least, the ratio of surface area to volume would change if you just scaled the hole up with the size of the whole donut, even if the math behind the claim in the story is BS.
How many starchy side dishes do you need? I usually splurge calorie-wise for Thanksgiving, yet I still end up with more green dishes than turnip/potato/squash ones.
Homopolar just means the electricity is not changing direction (i.e. not using AC power nor a commutator to mechanically switch direction of current in the wire). A current in a magnetic field will experience a force perpendicular to the current and magnetic field lines. There will be places in this where the field lines go radially (in and out of the tube) while the current is mostly going around the tube, giving a force in the third direction: along the tube
I see these topics come up every so often, about horrible gelatin combos from decades past. The funny thing to me, is there are a lot of good foods, like aspics and terrines, that are similar in principle to these dishes. The issue here isn't so much a savory gelatin, but probably the convenience factor combined with a recipe written to appear simple and novel instead of tasty and informative. Plenty of more boring things ended up that way too (I remember plenty of things growing up that I didn't like, that I later found out could be done well with considerably more effort).
It is something I've looked up before... and most of the limited work on health effects of static magnetic fields seems to find virtually no large scale, acute effects at fields strengths on the order of what is being discussed here. Most of the more obvious (but temporary) effects come from much stronger fields, and often involve moving relative to the field. Various studies of metabolic effects find subtle changes at lower field strength, but are not straightforward to connect to any big impact, and in some cases are of slight benefit. Citations saying otherwise would be welcome. Besides, a little design work can also minimize how much of that field goes to the inside of the helmet, although probably better motivated by trying to make more efficient use of the magnets than health effects.
I would be more concerned about how long the magnets last, as many don't like rough handling and collisions. Also, some thought needs to be put into how they are arranged to minimize changes of helmets being pulled together instead of pushing apart.
As said above, knowing the percentages would help, since at some point you have a small percentage that will say anything to be on TV or to make a joke.
And the only time I've bumped into people do something similar, both on a camera and for a written survey, they seemed to not have the greatest scruples/work ethic/understanding of what they were doing. They wanted to asked if I knew who my senator and representative was, or who was the Lt. governor. The problem was both times I was on a trip out of the state I live in, but neither surveyor seemed to care. When I told them who was "my" representative, they marked it as wrong one the written survey (the video one I didn't bother sticking around for). I also saw them pestering foreign tourists to answer their questions too.
That said, a lot of people I've met from countries other than the US asked why people and education in the US is so obsessed with history, and talked of how wars and history before the 20th century was rarely covered in their schools, as civics and contemporary issues were more valued. This varies a lot from country to country, but for some they don't see videos like this as a big deal (at least without being told that some of this should have been in just about every student's curriculum at some point).
I've found the price to be a far bigger issue than the convenience, as there are plenty of corner stores, cafes, and in-house cafeterias with ready to go salads (at least in areas with larger numbers of white collar workers, I know other areas differ). It is already expensive enough to buy food in those shops, and quite often I've seen salads as one of the most expensive options. And this isn't just in comparison to junk food designed for long shelf-lives, but in comparison to fresh sandwiches that are also healthy in the sense they have varied, fresh, nutritious ingredients, just they are more calorie dense.
Usually there is an option to do an emergency shutdown of the magnetic field, although I don't know how ubiquitous that is, and without proper setup of the room it might not be possible. And it tends to be very expensive to start the machine back up, involving tens of thousands of dollars of liquid helium, plus a lot of technician time. And there is still some risk to physical damage to the machine, or venting enough helium into the room to cause an asphyxiation hazard, if the room isn't setup well. Maybe they didn't have the option, or deemed it not life-threatening enough to risk using.
The Chernobyl Exclusion Zone is not completely unpopulated, with a couple hundred squatters still living there that never left, plus a few people still sneaking in to live there.
Still leaves me jealous of others, especially those that have been to Antarctica where some of these halos are a lot more common (plus it was warmer there last week). I still haven't seen anything beyond a 22 degree halo and sun dogs.
Most of the comments on previous aluminum casters I've seen also high recommend avoiding using aluminum cans, as they tend to oxidize too much and get too much junk in the aluminum ingot that will weaken the casting, even with removing the dross. You can add various things to the aluminum to help impurities separate out, and having some aluminum from a different source to get a pool started can help if you are quick at melting the cans though. But instead I've heard of people watching curbs for things like broken lawn mowers that have a cast aluminum engine that can be broken down to give higher quality aluminum for projects.
I would be more concerned about how long the magnets last, as many don't like rough handling and collisions. Also, some thought needs to be put into how they are arranged to minimize changes of helmets being pulled together instead of pushing apart.
And the only time I've bumped into people do something similar, both on a camera and for a written survey, they seemed to not have the greatest scruples/work ethic/understanding of what they were doing. They wanted to asked if I knew who my senator and representative was, or who was the Lt. governor. The problem was both times I was on a trip out of the state I live in, but neither surveyor seemed to care. When I told them who was "my" representative, they marked it as wrong one the written survey (the video one I didn't bother sticking around for). I also saw them pestering foreign tourists to answer their questions too.
That said, a lot of people I've met from countries other than the US asked why people and education in the US is so obsessed with history, and talked of how wars and history before the 20th century was rarely covered in their schools, as civics and contemporary issues were more valued. This varies a lot from country to country, but for some they don't see videos like this as a big deal (at least without being told that some of this should have been in just about every student's curriculum at some point).