Can you provide some source for this claim? I tried googling for the guys' names, and while a lot of stuff in the context of net neutrality comes up, I didn't see anything specifically about this particular thing.

The reason why they do it is because US citizenship is much more beneficial than their original one.

For someone who is already a citizen of a developed, stable Western European country, it's not anywhere near as one-sided as that.

Did you miss the part where they do not intend to move to US?

For Chinese, the equation is different, because their original citizenship doesn't really confer as many benefits.

But for someone in a Western European country, it's a very valid question to ask.

Nobody has observed high-energy ultraviolet photons naturally? Have you ever looked at the sun?

Incest is any kind of sexual activity with a close relative. What you describe is only a problem if such activity results in offspring. We've had contraception for a long time now, not to mention that not all sex is even potentially procreative in the first place.

The user's home directory (in Windows, that's %HOMEPATH%) is C:\Users\<username>. Documents is merely one of the subdirectories of that.

I don't know about Canadians and Americans in general, but it's certainly true about border agents. I'm not saying that everybody in CBP is an asshole, but based on mine (several times per year for three years) history of travel back and forth between two countries, the chances of running into an asshole were way higher when travelling south.

Banning weed did, though.

You mean, except for the fact that we observe each of them occurring separately, and are not aware of any reason why having one occur would exclude the other? From those premises alone it follows that it is a statistic certainty that they will all occur at the same time eventually.

To remind, alcohol was actually illegal for a while. Then it was legalized again, because the society understood that banning it leads to a worse result overall.

Why does the state even need to be in the business of telling sane adults what they can and cannot put into their own body?

Why does it matter? Alcohol and nicotin are both still way more harmful than weed, but we don't ban them outright.

That's a part of "space-like conditions".

That part is to guarantee success and have a thorough measurement of the process. For the natural process, it is reasonable to assume that it took many hundreds of millions of years before some place (and maybe more than one, over those years) happened to have all those conditions in it at the same time. The point here is that all the things that they've done and all the input materials are the kind that occur naturally. From there it's all statistics.

What are the power differences between, say, a brother and a sister?

If you think that time travel was off-topic in "Cat", I have to ask, what did you think the book was really all about?