Well, I *do* want an "AI PC", but not anything currently on the market. I want one that will understand books in HTML format and read them to me in a reasonably expressive tone. I'd also like it to be able to pause and then answer questions about what was going on earlier if I missed a point.
OTOH, I'd also want it to be strictly segregated from most of what I do.

That's the way the internet works on land these days, over any distance. Your multiple carriers all turn out to depend on the same infrastructure.

I don't think you understand the process of science. That is the appropriate reaction to any initial claim. An initial observation needs to be repeated by others, and the data that justified the initial claim should be reanalyzed by others to see if they agree with the interpretation. Then arguments ensue. Eventually people "pretty much" come to an agreement.

Sometimes the arguments last for decades.

It also suggests that as time goes by, dark matter will decay into normal matter (photons). Rather slowly, however.

Apparently you'll need to be able to see gamma rays to be able to see it.

I'm not saying any particular person said that, and the question to Slashdot was asked over 2 decades ago. But I was assured that SSDs were "now reliable as an archival store", despite my informal test failure. (I had backed up something to them, and stuck them in a drawer for perhaps a year. They became unreadable.)

My sample size was small (just a couple), but it decided me not to trust SSDs for backup even though everyone on Slashdot said I should trust them. What I'm afraid is that portable USB drives will start being main with SSDs rather than spinning rust without bothering to tell me.

Not a good idea, but you could try paper tape.

Interesting statistic. I haven't tried the drug, so my response is due to the results I've read reported. I'm a bit surprised that it's as high as 1/4.

The most common side effect I've seen reported is nausea. Sometimes that can lead to vomiting, but it doesn't usually.

They're passenger (and freight) trains. The rails were built for travel, not for scenic display.
OTOH, the sure aren't high speed rail. Most of the lines were build over 50 years ago.

OTOH, the BART example was for a "high speed train", though I believe the speed is limited underground. But the rise is from perhaps two or three stories below ground to about 1 story above ground. That said, I believe that the rise is about 2-3 miles long, so it's not steep.

N.B.: I good system of automated taxis could do the job...but note "good system". Most places I've ever lived the taxis were both too expensive and to difficult to use to do the job.

A HSR network is really problematic without a really good local transit network. (One you can reasonably carry your baggage on.)

Sometimes using the highway ROW works, other times it doesn't. This partially depends on the design of the highways, and partially depends one whether they have the same destination. A train station under a section of elevated roadway can work well...but if you don't have that convenient elevated roadway things can get more difficult.

I can't even estimate costs, but they can get pretty high. (And sometimes it's easy.)

Since there are trains that go over the rocky mountains, I think that argument fails. (But it might succeed if you argue practicality rather than possibility.)

FWIW, The SFBay Area BART system has high speed trains that move from elevated to underground. It's not a steep grade, of course, but it's done. (IIRC "high speed" for the BART system is around 70 mph, and is only obtained on the long straight sections. Of course, my knowledge is multiple decades old.)