I choose to believe that that is not a list of three similar things, but a list of different ways to be remembered.

Do you want to be remembered as dilettante competing in a crowded field who managed to have the right combination of skill and luck?

Do you want to be remembered as the one collosal idiot with a cult of personality, who claimed to work for humanity but only ever dipped us into a kessler syndrome and helped set the conditions for the Bell Riots?

Do you want to be remwmbered as the inventor of a revolutionary technology in desperate times that single-handedly averted the doomed fate of humanity?

Given the existance of The Big Mac Index, which seeks to compare global currencies and their respective buying power, this is actually fascinating.

The meter is defined by the distance light travels in a specific fraction of a second. It may have been initially defined by a rough estimate but it (and all metric measurements) are now fixed to universal constants.

Also the foot is currently defined exclusively as 0.3048 meters, so you are already using metric.

The standard way to streak a plate involves creating a resevoir of the sample you are studying, then using a sterile tool to streak through that at a steep angle. Then you streak through the first streak with another sterile tool, and so on and so forth.

As you streak through lines, the amount of bacteria pulled along is reduced until you are able to isolate individual colonies.

“Ahh yes, this will hide the cigarette stains.”

True. You can shoot lasers and such through a lot of things, but I am trying to describe a phenomenon in relatively simple language without getting too bogged down in the technical details. The question was about flowing liquids, so I assumed it was understood that that was what I was talking about.

Sound is transferred through a medium literally as a wave. When you get right down to the core of it, the wave requires movement within the medium to transmit.

So it might help to conceptualize it not as “Liquid cannot move faster than the speed of sound in it’s medium” but more like “The speed of sound in a liquid medium is defined by the speed at which energy can propagate in that system, which includes motion.”

“But, when I talk to people in general, most seem to not worry because they “have nothing to hide”, and most are only worried about their passwords, banking apps and not much else.”

Sounds like they have passwords and banking apps to hide, You should demand their bank account and credit card details to verify that they have made no illicit actions.

If they point out that they have no reason to trust you with that information, that’s when you point out that police, government, or corporate groups are made out of people just like yourself. They might have some codes of conduct, or a vetting process, but it just takes one person malicious or careless enough for you to be severely impacted.