Regular trains don’t run underground. Lots of opencast mines exist .

Basically all mines have an above ground terminal where whatever you mined is unloaded from your underground trains, lifts, haul trucks or whatever else onto storage piles, then loaded onto the actual long distance trains.

If the mine entry is up a mountain, then the trip down from that point will be a net energy producer regardless of anything else.

I wouldn’t be surprised if there are electrified railway lines doing the same. Regenerate large amounts of energy into the grid while descending loaded; consume a relatively small amount of energy to haul the empty train back uphill.

If you’re thinking of that CGI crane lifting concrete blocks, it’s unfortunately a really bad idea.

Pumped hydro stores energy by lifting weight uphill, instead. Water is basically the cheapest thing you can get per tonne, and is easy to contain and move.

To store useful amounts of energy using gravity, you need pretty large elevation differences and millions of tonnes of mass to move.

I feel dumber having read that.

Banning a whole country because you disliked a company?

Dealing with stuff that’s ‘almost working’ is often harder than starting from scratch; ask any tradesperson.

They also apparently cannot get their heads around the fact that people might give you a discount if you advertise their brand. Ad-supported pricing has been around for a long time; it’s not some voodoo.

Until the day comes that I get a letter in the mail from the government saying, “Here’s how much you paid in taxes, if you’re cool with that then please disregard”, I will not be satisfied.

NZ does that. More accurately, they email you to tell you that there’s a letter available online - I don’t think they send physical mail by default.

Then they pay any refund straight into your nominated bank account.

"We are gentlemen at the World Conker Championships and we don’t cheat. I’ve been playing and practising for decades. That’s how I won.

Mr Jakins won the men’s competition but lost in the overall final to women’s champion Kelci Banschbach, originally from the United States, who only took up the game last year when she moved to Suffolk.

Hmm.

Requirements often depend on the type of building occupancy and the chance of fire spread to neighboring buildings.

“Lossless” isn’t the term you want; that refers to not lossily compressing the main data. Lossless compression or storage of media is very rare outside of text and sometimes audio, because it ends up so large.

You want to preserve metadata. That applies regardless of how lossy the data compression is.

Not to scale. Left triangle shows that the centre tee is actually 80/100⁰, not two right angles. So right triangle is 100+35+45, angle x is 135⁰.

135°.

The non-right-angle is downright cheeky.

From article:

He said the term “coconut” was a “well-known racial slur which has a very clear meaning” to the effect that “you may be brown on the outside, but you’re white on the inside. In other words, you’re a race traitor – you’re less brown or black than you should be.”

That’s a different definition of ‘coconut’ than I hear here in NZ. Here it’s usually just a (derogatory) term for any Pacific Islander, because they come from where coconuts come from.

Gotta love slang/slurs.

Any hard drive can fail at any time with or without warning. Worrying too much about individual drive families’ reliability isn’t worth it if you’re dealing with few drives. Worry instead about backups and recovery plans in case it does happen.

Bigger drives have significantly lower power usage per TB, and cost per TB is lowest around 12-16TB. Bigger drives also lets you fit more storage in a given box. Drives 12TB and up are all currently helium filled which run significantly cooler.

Two preferred options in the data hoarder communities are shucking (external drives are cheaper than internal, so remove the case) and buying refurb or grey market drives from vendors like Server Supply or Water Panther. In both cases, the savings are usually big enough that you can simply buy an extra drive to make up for any loss of warranty.

Under US$15/TB is typically a ‘good’ price.

For media serving and deep storage, HDDs are still fine and cheap. For general file storage, consider SSDs to improve IOPS.

I don’t remember if they fully closed the loopholes, but there are inputs that programs cannot catch unless you actually replace the OS.

Here in NZ they do a factory reset on your calculator at the start of every exam.

When you download a torrent, you’re downloading it from someone else’s computer. That ‘someone else’ is usually an individual, not some file sharing site with redundant servers.

When you download a torrent, someone had to send it. It’s a small cost for individual torrents, but they had to pay for energy, internet connection, hard drives etc. If more people seed the torrent, you get a small bit of it from each seed, spreading the burden.

If no-one with the torrent has their computer on and seeding it, you cannot download the file, because there is no-one to download it from. If there are several seeds with the torrent, then you can still download it even if one or more seeds turn the computer off at night, delete the file, or are overloaded.

Yeah, I posted it to the wrong sub.

Even 95% is on the low side. Most residential-grade PV grid-tie inverters are listed as something like 97.5%. Higher voltage versions tend to do better.

Yeah, filters essentially store power during one part of the cycle and release it during another. Net power lost is fairly minimal, though not zero. DC needs filtering too: all those switchmode power supplies are very choppy.

SpaceX has enough of a lead over everyone else that I don’t think them simply being denied government contracts is feasible, in a too-big-to-fail way.

You’d see some kind of forced nationalisation or being strongarmed into selling to another defense contractor on national security grounds.

Elmo might choose some kind of “if I can’t have it, no one can” sabotage though.

B key vs M key. Laptop likely needs a SATA M.2 using B or B+M keying, you have a PCIe x4 drive with M keying.

I’m not sure there are any power grids past the tens-of-megawatt range that aren’t just a 2/3/4 terminal HVDC link.

Railway DC supplies usually just have fat rectifiers and transformers from the AC mains to supply fault current/clearing and stability.

Ships are where I would expect to start seeing them arrive, or aircraft.

Almost all land-based standalone DC networks (again, not few-terminal HVDC links) are heavily battery backed and run at battery voltage - that’s not practical once you leave one property.

I’m sure there are some pretty detailed reports and simulations, though. A reduction in cost of multi-kV converters and DC circuit breakers is essential.