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Thanks for comments. I will inform my friend.

Lavender oil, lamar varnish mixed with mineral spirits and something else, and she has tried linseed oil.

I will ask her what she has tried. As for essential oils she seems to be under the impression they can be toxic to some animals in ways they aren't to people. I don't think magic is a consideration. Lol.

Perhaps, but some think the paint thinner fumes are what gave Bob Ross cancer.

My friend is an oil painting artist and is concerned about the toxicity of paint thinners. She says she has found things labeled "non-toxic" and yet they warn not to get any on you. She has dabbled with essential oils but is worried that might be bad around her cat. She has small work space...

I think this video explains the assumed cause of the cardiac arrest.

A relative who is a nurse said something about an impact hitting the chest at a particular moment in the cycle of heartbeat is what it might take to throw it out of sync. So this probably is a freak accident. But it is still horrible that this is a sport that they feel the need to pray before...

Definitely jousting if it goes to OT.

I hope someday gene therapy can promote brain damage repair.

A pillow can never be a weapon? Couldn't padding be so much that moving with it is half the battle? Knights had mobility issues, but were largely safer from swords in their heavy metal casing?

I don't know much about forces, speed, and what is needed to cushion a blow. But after seeing the serious injury of Damar Hamlin, is there a way to create equipment that can easily cushion any impact an NFL player can apply to another player? Or does the equipment get too heavy by that point...

Well thanks all for the formulas.

Those are the volumes I got also. Weird that it would be labeled as 10gal and 18gal if one is actually evenly double the other.

One bin is 18gal and taller, the other is 10gal and shorter but longer. They are Sterilite brand storage bins so they aren't really for holding water, nor do I want to waste any. I measured the first at about 16" to 18" long, 12" to 14.5" wide, and about 15" tall compensating for the lid. The...

Meaning one bin claims 20gals and the other 10gals.

Oh, just curious how accurate the sticker is about its volume and to compare similar bins that claim 1:2 volume differences.

I have a storage tote that has a larger top than bottom. How do I figure out its volume? Is this like a 3D trapezoid? Can I measure the volume of the rectangle assuming the top is the same as the bottom, then as if the bottom were the same as the top, then just subtract the two?

Hmm. No easy task I guess.

So I wouldn't be able to look at a formula for a substance and calculate how acidic it is?

I think baking soda can be used to neutralize acid, but not sure if it adds flavor.

I wasn't aware that muscle tissue could be used instead of the teflon. Wouldn't the body absorb something organic like its own tissue? So no way to promote growth of an artery in a different location in a way that directly causes the troubling one to shrink and disappear? In some cases an artery...

https://www.mayoclinic.org/diseases-conditions/trigeminal-neuralgia/symptoms-causes/syc-20353344 Longest lasting surgery for it when it succeeds. https://www.upmc.com/services/neurosurgery/brain/treatments/microvascular-decompression

Do you by chance have a table of chemical formulas and their respective PH level so I can visualize it better?

I was curious if veins or arteries are ever reabsorbed or can be prompted to? I have been reading into trigeminal neuralgia which is an agonizing condition that leads many people who get it to committ suicide. Often it is the result of an artery pressing on the trigeminal nerve and gradually...

I want more OH than H ions? I assume the above includes 2 H and zero OH?

Carbon dioxide has no PH because it's a gas? How is it known how a gas effects PH of water when desolved?

Do you imagine how connected a person feels to the world is reflected in how functional they are? Perhaps geniuses feel particularly connected to external reality? Meanwhile autistic people might have trouble breaking through? I know genius and autistic brains have been scanned with one imaging...

I have had seltzer water which is merely carbonated water which is more acidic hence a more sour flavor as shown in link below. Is there a non-toxic gas that can be added to water to give it bubbles that actually makes it more alkaline? And if so, perhaps combining it with carbonation so the PH...

Well certain conditions make things seem less real, some drug use makes people think things are "realer than real." There must be blood tests and fmri data on people in these conditions to show evidence as to a cause?

No it was an NIH article. I realize DID is quite rare and many think it's a false diagnosis, but the idea of how the brain accepts things as real outside of itself is very interesting to me...

I have read people with schizophrenia and DID may experience thinking that the world has become less real. Are certain parts of the brain acting up that could be making reality seem less real?

I have trouble understanding your methods. I am not good at reading math notations. And convincing myself that it does equal for all images is what I care about. If I needed to stack much more than 20 images I would probably use an auto tool anyway. The manual method doesn't work with anything...

If I had 6 layers instead of 5 I would simply multiply everything by .83 on top of everything before that. That is 5/6ths.

Your post at 22 appeared to be mostly visual which relies on healthy retinas which I don't have. I assume my process works because I ended with all layers having 20% left. Would different numbers result in the same outcome?

What do you mean? Doesn't this method show that each photo is equally represented? That is what I wanted to do rather than take anyone's word for it.

20% 25%, 20% 33.3%, 26.66%, 20% 50%, 40%, 30%, 20% 100%, 80%, 60%, 40%, 20% 100% is on bottom and 20% on top. Since 20% is the top opacity it leaves 80% of all of the layers below it. So .8 times 100% brings it down to 80%, 50% down to 40%, etc. And then I apply layer 2 to 3, 4, and 5 by...

Ok, finally figured it out. Top to bottom. I basically take the value of the percentage and divide by 100 to get 1 or less decimal and subtract from 1 to get opposite portion and multiply that by everything below it. At the end everything was 20% left. 20% 25%, 20% 33.3%, 26.66%, 20% 50%, 40%...

I really appreciate the visuals. Not sure where you found those images. But I still don't know the math of why those fractions in particular are used. I know if there were 3 images and there was no order than each would be at 33%. It's like the bottom layer which is set to 100% if there were 5...

I just want to see numerical proof that each image is represented equally.

So layer 5 is 20% and subtract 5% of the 4 layers below it?

Still can't visualize it as a table. Is there another way to draw it out? Maybe fractions or series of divisions. I mean when I do 3 images do I multiply the 50% and 100% by 1/3 or what? I actually had trouble even getting this opacity procedure from a photography forum because most of them use...

1.0, Reduced to 0.5, Reduced to 0.16, Reduced to 0.04166 0.5, Reduced to 0.16, Reduced to 0.04166 0.33, Reduced to 0.04166 0.25, Added 0.25 I tried to figure the influence of each layer added on top of every other layer minus the last one which is set to 25% which is clearly the only weight...

I don't understand that. If you wanted to mix 3 colors in equal parts wouldn't each be 1/3 parts each? But images in a particular order in software wouldn't be different? I tried to do the Harris Shutter effect in software using 100%, 50%, and 33% and although it looked interesting it seemed...

I am not a student. This isn't actually homework. But whenever I post anywhere else in this forum they delete it as being too dumb for a serious research forum. Wasn't sure where else to go for what might be a simple math problem.

I was given the above opacity levels for stacking photos to create an equal average of all photos as a single photo. Can anyone explain how this works? I suspect if I had 4 photos labeled A to D I could combine A and B first, C and D second, then AB and CD last, all at 100% bottom layer and 50%...

Awesome. Thanks.

Is there a way to create a map from satellites showing how much light pollution there is on earth? For example if you wanted to do astro photography and wanted to know how far away from city you need to drive to see certain levels of detail from galaxy?

That's a little bit of a bummer. The pictures of Jupiter were quite sharp. Would of been curious to see Earth in higher resolution.

What limitations does Webb have that Hubble doesn't besides higher resolution? I assume Hubble doesn't need to hide in Earth's shadow? Can Webb photograph earth?

There are different ranges of IR. Are they all represented as heat? If not maybe Webb telescope can read those only so our own sun isn't as much of an obstacle? Maybe xray instead?