My neighbor, a very white dude with a Germanic last name, is a self-proclaimed Shaman - has a business web site and everything. Husband thinks he is a drug dealer. I think it’s a tax write-off. Either way, he has folks over at the equinoxes and they stand around a fire and beat a drum for a bit.

It’s curious, but so far, harmless.

And while alerting your buddies, COP is a lot shorter than Police Officer.

mom is the world bank/general population (the basic source of money)

candy is any commodity like oil

you and your brother are contries/goverments

Stores are commodity producing countries, you are banned from buying in specific places because of politics/sanctions/ custom duties

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How is it not eli5?

Are you sure? That sounds more like a backronym to me than an actual derivative streetword. From what i also heard, policemen used to wear copper badges or helmets (?) and the distinctive appear made them be called "cop" as a slang

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Cop is short for Constable of Police, thats where its from

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That’s a really good analogy that I’ll have to steal! Like a 65kg shoulder bag on only one shoulder for a few hours every day

That's correct, but OP wasn't talking about the danger to passengers who only pass by security a few times a month or year, they're talking about the operators who sit there all day long, 5 days a week, the whole year.

In primitive cultures, someone who doesn't know any better.

In western society, a fraud robbing people of their money.

An in falling observer is a non accelerating observer by definition. An in falling observer is inertial. You are viewing the world from a newtonian perspective. The proper acceleration of an inertial observer, is 0, an observer acting under only gravity is inertial, they are following a geodesic, that’s literally why they are falling. This is essentially what the equivalence principle is telling you. There is no “gravitational force “ pulling you.

In Kruskal-szekeres coordinates you can clearly see the event horizon is not defined for the in falling observer. The event horizon is not defined for observers following a geodesic

You are getting confused here, for reference my specialism is in general relativity, this is the field of research i do.

That's correct. The full body scanners use millimeterwave radiation that is non-ionizing (can't cause DNA damage) and barely gets deeper than your clothes.

The metal detectors don't use radiation at all, they use magnetic fields and detect changes in the field as metal passes through it.

Every time an exhaust valve opens in a cylinder, the residual pressure of the exhaust gases is suddenly expelled thorugh the exhaust, causing a loud "pop". In most engines, the pops are regularly spaced, creating a regular "tone". In the V arrangement, two pops happen close after one another, and then there's a longer delay before the next two. This causes the characteristic noise.

In Ireland and the UK, we have Bobby or Peeler to mean a Policeman. They originate from the same thing, an Prime Minister, Sir Robert (Bobby) Peel (Peeler) who set up the first modern police force in the UK, about 200 years ago.

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Cop is a shortened version of copper. I read a long time ago that police had copper badges, so that is where the name originated. It could be completely wrong.

If you are talking about the full body scanners that you stand in and raise your hands, those are not Xray. Only the things that scan bags are xray and they have shielding tunnels.

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The machine in the airport only scans things inside it, it doesn’t leak X-rays outside. In hospital the entire room with the patient is the machine. The reason for this is that it’s not possible to remove a part of a human body, put it in the scanner and then put it back on the body. And full body X-rays would be excessive and unnecessarily dangerous. So they only shoot X-rays through the specific body part in interest while the patient is in the room.

Unless you have certain underlying medical issues, occasional exposure is fine.

If you're taking an international you're being exposed to more radiation, anyway.

Doctors and nurses go behind a shield because it would be constant radiation over many years. This can and does cause health issues, not limited to cancer, but cancer is a big one

i know - but surely if they all eat so much is that enough for them?

whats your point?

Yeah, the redshift of light happens for the same reasons but rather than dilating the time, its about contracting lengths.

That isn’t the reason, the reason you don’t observe time dilation in your own frame is because as an in-falling observer you are not accelerating or in motion (you always see yourself at rest), so for both the in-falling and outside observer to agree on the local speed of light, they must disagree on space and time. (Although a specific combination of these is conserved)

The in falling observer actually can’t even define where the event horizon is

Note that time dilation is not an experience. It is only an observation that is measured by someone else.

If you approached the event horizon of a black hole, then you would just cross it normally. You wouldn't slow down.

If I tried to observe someone crossing the event horizon of a black hole from far away then they would literally never cross it from my frame of reference. And yet, they still do.