John Cuthber

The most likely explanation is simply that they are clueless.

4 hours ago, Sensei said:

When you distill something, you must slightly exceed the boiling point of the substance. Check the ethanol chart, and you will have the answer to your question..

The real question is why they think you can boil something at 120 F.

That, together with the impossible yield and the nutrient poor recipe, suggests to me that you should not seek guidance from that site.

49 minutes ago, StringJunky said:

If one don't know the whys and wherefores of distilling and go the pure sugar yeast and water route, methanol poisoning will probably be the outcome.

And where would the methanol come from?

50 minutes ago, exchemist said:

Eh??

That's what I thought.

About 95% of the population don't live in the USA.
In the UK I can make pretty much as much wine and beer as I want, but I can't legally distill (including "freeze distillation") or sell it.
So, I can tell you that the recipe needs nitrogen and phosphorus.
Diammonium phosphate is traditional.
I can also tell you (because I'm a scientist) that anyone who thinks you get 9 jars of "moonshine" from a gallon of sugar and bread-yeast is either nuts or has a very weak drink.
 

Moonshine...

Titanium dioxide, which is a very popular white pigment, absorbs UV rather well.
https://www.researchgate.net/figure/UV-Vis-Diffuse-reflectance-spectrum-of-bare-TiO-2-nanoparticles_fig6_320324473

Plain cellulose (and therefore, cotton) doesn't absorb near UV but it does scatter or reflect it.

https://www.researchgate.net/figure/UV-Vis-diffuse-reflectance-spectra-of-pure-cellulose-a-cellulose-film-with-stamen-like_fig3_319232616

22 hours ago, ivanginato23 said:

Does the instruction given right above (the bold one) produces the sodium cholate solution?

No.

Sodium cholate is not an enzyme.

In principle, you can obtain the cholic acid from bile- if you can get that.

"Do we really need complex numbers?"
It depends on whether or not you want to be able to solve quadratics.
If you want solutions, then you have to put up with complex numbers.

Am I the only one who regrets the passing of metal biscuit tins and their replacement by plastic ones?

On 10/22/2022 at 10:59 AM, studiot said:

Why would you need a greenhouse-like structure ?

Ever heard of photosynthesis?

Estimates vary but the current approval rating of the government is about 20%.
The government is opposing a general election on the basis that the population would kick them out.
 

 That's not democratic.
There's also the underlying problem; the current government was elected even though most voters preferred a different party.

We need a new electoral system to replace "first past the post".

The wash cycle will have done a pretty good job of removing bacteria and mould spores. 
So, even if the pillow was just sitting in the drier, there won't have been much microbiology happening.

On 10/11/2022 at 2:16 AM, TheVat said:

A lot of call for trumpets at funerals? I'm intrigued.

 

People would pay me not to play.

It's interesting. I recognise the desire to teach kids the value of work.
But, if you pay them to do chores, you undermine the idea that they should do them simply because they need to be done. 

On 10/8/2022 at 8:55 AM, matus said:

would it be possible to create a gene therapy to produce low, but constant levels of heavy metal (at least some of them- Hg, Pb, Pt) chelating agents in the blood?

That's still magic, not medicine.
 

8 minutes ago, CharonY said:

Metal ions are too small to be antigenic

That's a matter of definition.
https://en.wikipedia.org/wiki/Nickel_allergy#Epidemiology
 

57 minutes ago, bangstrom said:

Air is an insulator so getting rid of the air would make it worse. A capacitor would work to stop sparking.

A vacuum is a much better insulator.

Yes

I'm not saying it's a good idea but...

If you use solar power to drive the cooler then the heat (including the waste heat from the electrics etc) is exactly the same as if the sunlight just warmed up thee ground.
The conservation of energy leads to the question "how could it be different?".

20 hours ago, Sensei said:

I advise you to calculate the volume of water, calculate the energy needed to lower the temperature, calculate possible energy harvested per device (not just peak maximum), and calculate the number of devices that will be needed.

I realise the temperature of lakes will go up more or less in line with global warming.
But is there any reason to believe that the lakes are particularly susceptible?
Why focus on cooling lakes rather than, for example, cooling fields?

Unfortunately, I can't see that being cost effective.
There's no reason to assume that lakes are much warmer than they were before mankind got involved.

Freeze it until it's not "rubbery" then machine it quickly.

7 hours ago, we2 said:

I started studying which led to my belief in God today.

What on earth did you study?

If you are seeking to mix gases, I have good news for you; the laws of thermodynamics are on your side.
If you arrange the gas feeds to the tube to be fast and tangential so that they "swirl" down the pipe, they will mix very rapidly.

On 9/19/2022 at 6:53 PM, ferrocene2 said:

K. Goralevich said that iron tetroxide, or perferric anhydride, FeO₄, or perferric acid, H₂FeO₅, is probably formed as a volatile, unstable compound when barium perferrate, BaFeO₅, is treated with an excess of dil. sulphuric acid, at a low temp.

Where does one get the BaFeO5 from?
It's hard enough to get 

https://en.wikipedia.org/wiki/Barium_ferrate
And someone is suggesting taking another couple of electrons of the iron.

I don't doubt the existence of Fe 8+ ions in the sun, but I don't imagine they have any chemistry.

Much as I like reading old textbooks, I don't always accept their claims at face value.
The difficulty with doing analysis to determine the oxidation state of the iron would be great today and I simply don't think they would have been able to guarantee accuracy back then. (This might be one of the examples of Mossbauer spectroscopy actually being useful.)

Certainly the WIKI page doesn't say anything about Fe(VIII)
https://en.wikipedia.org/wiki/High-valent_iron

55 minutes ago, ferrocene2 said:

I well remember Cotton and Wilkinson although I no longer have a copy. Were they aware, I wonder, of Fe (-II) and Fe (0)?

They were. I have a copy from 1962. It mentions the carbonyl complexes as examples.

11 hours ago, MigL said:

Oh you Brits and your gin.
When your neighbours make perfectly acceptable scotch ...

It's not an either/ or thing.

Have you seen this?