It is loosely defined from my perspective, but I am curious about harder rocks, like granite. Your standard everyday rock tends to be much more brittle and may not have a high metal content. (It will likely have iron in one form or another though.)
Most metals and rocks are crystals in their “normal” state, so I see what you are getting at.
In these cases the rock may be hot, but it’s not molten. I was even just reading that many rocks will not have any internal stresses from being bent because of the forces and the time that is involved.
Ok, I knew those genes were called something! Thinking about homeotic gene mutations has sufficiently jumbled my brain again though. (Hopefully, if I can code a simple analog to represent them, natural evolution can sort out any mess homeosis creates.)
Yes, thank you. That is exactly what I am looking for. I dunno what I expected, but I was hoping that I was going to avoid a ton of maths. Alas, everything seems to be math. /s
For those who are interested, this led me directly to these:
It has been used frequently by Ukrainians describing Russians in recent times. I have to admit, the description is fitting for an invader from the perspective of a Ukrainian.
orc - a member of an imaginary race of humanlike creatures, characterized as ugly, warlike, and malevolent.
I didn’t know that. Chloroform always helped my girlfriends melt into my arms, but I never thought about its use on PLA. (Huge /s for people who think I was serious.)
While I was googling around about chloroform smoothing, I also stumbled upon ethyl acetate as a smoother for PLA. It’s probably better for your internet search history to go that route instead. I have a ton of weird shit for my engineering fascinations, but a bottle of chloroform would probably be at the top of that list.
If it’s etched, it’s chemical damage. Just from my 3D printing alone, I know that common chemicals (generally acetone or various alcohols) can easily damage and melt some kinds of plastics. So, I agree. I think we found part of the puzzle.
And you are welcome! Thanks for letting me spew out theories.
It could be a couple of things that I am aware of.
Dust would be the most obvious. Many plastics can hold a static charge and dust can stick to it. The pattern looks “splotchy”, so if not static electricity, it might be oils or some other kind of chemical that is mildly sticky. (Injection molding can sometimes use release agents during manufacturing that are rarely cleaned off. Don’t eat random bits of injection molded plastic, kids.)
Simple moisture could be the issue as well. If you have been using your air conditioning, it’ll get the plastic cold and water can condense on it. Dust or something else might be sticking to it. The water could dry, leaving behind the dust and obfuscating the root cause.
While it could be a mold of some kind, it doesn’t look too much like it. That would point to existing mold in the ducts that is sporulating. Those kinds of house molds are usually dark and nasty, not white. White house molds exist but I suspect it’s region specific as to what kind would grow where you are at. (I grow mushrooms, so I have a supply of petri dishes I would test that substance on, TBH.)
Just for good measure, check your air filters. It’s something you need to do anyway and if they are nasty or old, you could be circulating excess dust in your house and it’s a sign the filters need to be changed. Air filters are functional! Air conditioner heat exchangers can get clogged and, depending on the type of unit you have, be somewhat costly ($500-$1500) to clean properly. I have paid for this procedure twice before I found out that the air filter assembly is garbage in my unit.
Is the substance oily or powdery? If you clean it off, how long does it take to come back? Did someone spill something near that register that you weren’t aware of? Were the carpets recently cleaned?
I am sure that HVAC people may have a more direct answer, but that is my list of things to check.
It’s the splotchy pattern that is bugging me though. It’s highly unlikely that something is getting sprayed out of the air ducts, other than small quantities of water condensation.
There are many flavors of political views and you can be left, or left-center and still support free markets and capitalism.
Believe it or not, it’s possible for a person to hold right and left ideals simultaneously. As an example, you could say that a person is to the right or left of what you believe and that is much less of a blanket generalization.