According to Picard in the Movie First Contact money doesn't exist anymore. I guess those latinum bars are only used by Ferengies, in border systems and outside the Federation.

That doesn't mean there's nothing that measures expense. The Federation might have a lot of available resources but they can't be infinite.

1. Some episodes and movies show ships that are essentially flying holodecks. Energy doesn't seems to be a problem.
2. That's the point: You don't need real-world things. The reason the holodeck is so large is to accommodate dozens of people at the same time.
3. Some kind of multiplayer function across several holodecks should be possible.
4. You either have a holodoctor for everyone who needs one or the few medical practitioners see a holo of their patient on which they operate. The holoroom the patient is in then replicates what the doctors are doing.

As for why all rooms aren’t holodecks/suites in the 24th century, probably due to power consumption.

It's been a while and I might not remember correctly. Wasn't there an episode in Voy? with holographic lifeforms that rebelled against their creators and lived inside a flying holodeck ship? And there was that Insurrection movie in which a whole village was teleported into a giant holodeck ship.

It seems possible.

I'm not sure what the English pronunciation of "n-jinx" sounds like but I'm pronouncing it "engines" as in plural of engine.

What problem(s) does this nationalization and the 'people's car' solve?

I'm sure they did that because the ~10-15 nukes stored somewhere in German are of USA origin. The USA might still stored some more in their airbase in Ramstein.

Are the Rafale's weapon mounts and system compatible with American nukes? I wouldn't expect that.

That's real. Vikings did a lot of breading and added beads to beards and hair. They also sometimes shaved the sides and had asymmetric haircuts too. We know the hair styles from their graves. The length of hair varied. They let them grow out and cut them when they were long enough. You could do a lot of things with such long hair.

The viking hair styles you see in the movies are mostly real.

But vikings did not have dreadlocks. They probably didn't know about them.
This is wrong:

And this is wrong too:

They also often wore necklaces and wristbands with runes made of silver, iron or wood. Something like this:

This was to either show your wealth or as an amulet. The futhark (runes) were not just an alphabet they also were magical characters. Each rune had its own special meaning.
For example ᚠ (fehu, engl. cattle) stood for wealth, abundance and security. You wore that rune if you wanted that. And smiths added runes to tools and weapons to add magical powers to them.

nd at one point during the constitution process they had a vote on which language should become official. And it almost was german, btw.

That's a modern myth. IIRC there was a newspaper that had to decide to publish either in German or English and they decided in favor of English. The USA doesn't have an official language but de facto it is English.

Nah, I switched to cycling because of the weather. In the winter it took me longer to clear the car windows of snow and ice that the actual drive to my work. Now with a bike I'm about as fast as with my car in total. But a bike costs less than a car - by a lot! It's something like 50-80 bucks per year including a service at my local bike dealer. That wouldn't get me enough gas to keep my car running for a month.

If weather is a concern for you then you need to research how to cloth yourself for different kind of weathers. It's perfectly fine to ride by bike in -15 °C (5 F) or strong rain with the right kind of clothes.

I don’t ride in the rain

That's probably the difference between us. I ride all-year all-weather.

But I'm just a lazy fuck with a common ponytail because I don't want to visit a hairdresser every few months.