"... potash, an organic compound..." - immediate Gell-Mann amnesia effect. Potash is the soluble, inorganic leftovers of burnt plant matter.

What's interesting is how many different names derive from this production method. - potassium from "potash" (pot ash, collected burnt stuff) - K from "kalium", related to calcine (burn to ashes) - Alkali for basic compounds, which nearly all soluble metal oxides are - Calcium and Ca also derive from this root

(now let me check all of this so I don't Gell-Mann myself)

Wikipedia suggests that several different minerals have been called "potash", of which one (potassium carbonate) is organic and the rest aren't.

Metal carbonates are generally not considered organic.

The terms anode and cathode are reversed. Mnemonic device:

Anode - ants - bad - negative

Cathode - cats - good - positive

This is the opposite of what I understand: anode positive, cathode negative.

Google (and multiple other sources) confirm my understanding:

  an·ode /ˈanōd/ the positively charged electrode by which the electrons leave a device.
  cath·ode /ˈkaTHˌōd/ the negatively charged electrode by which electrons enter an electrical device.

It depends on whether you're talking about electron flow or conventional current, because they're opposite each other. The original mnemonic is incomplete because it doesn't specify to which it refers.

left hand side of the road, or right hand side of the road?

You've lost me.

Different domains have different conventions, regardless of what may be in a definitive reference.

obligatory xkcd https://xkcd.com/567/

Can you recommend some other Xometry/Hubs competitors for hobby use?

I can't tell if this is sarcasm. Anyway, I think my exposure to gasoline is higher than to sunscreen.

Not sarcasm. After driving electric for a while (used are affordable... at least until the last couple months when the price of used cars went through the roof), the smell of gasoline seems especially pungent.

Funny you say that because I specially like the smell of gasoline, kind of like smell of glue or diesel exhaust. I know, kind of weird but I know a lot of other people who are in the same boat.

There's a relevant line from the book "Generation X" about gasoline: "Isn't the smell of gasoline great? Close your eyes and inhale. So clean. It smells like the future."

(The 1991 book "Generation X" is what popularized the term "Generation X", for those who didn't know there was a book.)

I've heard but cannot verify that eating more potassium will make it smell bad again. That is, that a mineral deficiency may cause some things to smell good that otherwise wouldn't.

I know someone who had an intensely positive reaction to wet, musky smells (think basements, dirt, old carpets, that sort of thing). Their doctor put them on vitamins for a separate issue and the attraction went completely away.

Funny how seemingly unrelated stuff tells you something as fundamental as this about someone. I wonder what other deep secrets about our lives we're exposing that we're completely unaware of by just being ourselves.

Some people are actually turned on by the smell of gasoline somehow

Why does the Chalk Cream have sodium hydroxide in the ingredients?

Good question! Because we produce in the EU we need to list all ingredients. The sodium hydroxide is a Ph stabilizer commonly used in low doses in cosmetics. It was actually the FIRST thing I asked our lab when they gave me the final INCI.

Yes, I suppose having a concentration of hydroxide is good to keep the carbonate from reacting and bursting the packaging.

The way I understood it is that Ph needs to be within a certain band of values in cosmetics and the last ingredient in the INCI guarantees this.

Let's go tidepooling!

Almost the same, but it doesn't imply collection, just observation.

They also have a case design guide with some interesting details on the phone sensors. https://www.google.com/url?sa=t&source=web&rct=j&url=https:/...

Without involving Google:

https://developer.apple.com/accessories/Accessory-Design-Gui...

I’m surprised this isn’t behind MFI.

This is the first time I’ve seen device schematics for Apple products, super fascinating to say the least. Thanks for sharing this gem!

Would it be a bad idea to salt and hash probable increments of a password when it is changed? For example, password would be salted, hashed, and stored along with Password, password1, etc.

Then the system could reject these on the next password change without storage of the original plaintext password.

ixwt gave a better solution - do these calculations when the password is changed, not when it is set. Therefore, less storage is required

Are there any studies or wisdom on getting multiple types of vaccines?

There was a trial running in the UK testing giving differing doses of vaccine [1], although I've not seen any results from it.

[1] - https://www.bbc.co.uk/news/health-55924433

As a mechanical engineer: - I wish we would use git like our software friends - I wish commercial CAD programs had humane file formats and command line interoperability - I wish commercial CAD programs would be supported on Linux - You can pry MS Excel from my cold dead hands.