Antiprotons, the forbidden PopRocks

I even wonder why they haven't done it much sooner.

We didn't have good ion thrusters back in the 50s, 60s and 70s and after that launching nuclear reactors into space was considered a bad idea, not without reason. A nuke plus ion engines isn't a slam dunk either, ion engines produce very little thrust and reactors are heavy even if you don't have to bother shielding them much, so there's an efficiency threshold you need to hit before it's worthwhile.

NASA has realized that beating, or at least competing with, the Chinese to a moon base is probably going to require a reactor, so why not demonstrate it as part of a drive too?

the original formulation of relativity and physics in general did not distinguish between rest mass creating gravitation and light speed particles generating gravitation

Maybe you have access to some early draft notes of Einstein's, but in his actual papers on relativity mass does not "create gravitation." Energy, momentum and some off-diagonal terms like stress and pressure gravitate. There is no mass term in the stress-energy tensor, nor anywhere else in the Einstein Field Equation. Mass is not fundamental in relativity, it's a property of a system. That property is the product of energy and momentum (and the other stuff) in particular configurations within the system so in many situations it can be used as a surrogate for the underlying energy, momentum and other stuff.

Physics prior to relativity did indeed say a lot of different, confusing things about mass, gravitation and light speed particles.

"Creating fusion" isn't hard. Kids do it for science fair projects. Here's a guy on Youtube making a fusion reactor.

Making a fusion reactor that produces more electricity than it uses is hard. That's what you're thinking of. Rocket engines famously do not usually produce electricity, and if they do they do it extremely inefficiently, so it's a completely different problem.

we don’t have massless drives

Reactionless drives. A massless drive would be an engine that didn't have any mass, I guess. We have lots of drives that don't involve throwing mass out the back, including solar sails, magnetotorquers, electrodynamic tethers, flashlights, etc. Hard drives have a few. Your car has at least one big one and a bunch of others besides, as does your body. None of them are reactionless though.

Reactionless drives are called that because they violate Newton's third law, which is really a statement about the conservation of momentum.

Individual photons don't have mass, abstract or ortherwise, they have energy and momentum. Individual fundamental particles of any kind don't really have mass because mass is a property of a system.

A system of multiple photons can have regular old non-abstract mass if they're configured properly.

While it is an enormous problem, possibly the most significant, we know how to shield against radiation, but it's going to take mass in the form of hydrogen-rich molecules like water or polyethylene (as examples). To solve that problem we are either going to have to make launches a lot cheaper, or figure out how to do it all in orbit.

It's at the edge of our technological capacity to produce such a spacecraft now, so the barrier is economic. That's a massive barrier, but in theory we definitely could, if we put a significant percentage of GDP of the wealthiest nations towards the project, produce a spacecraft that keep astronauts alive and relatively protected from ionizing radiation both on the journey and while on Mars.

As to your general assholery, I guess everyone has to have an outlet, though why Slashdot is a bit mysterious.

Delete your account if you want to, but please don't delete posts and comments. I sympathize wanting to stick it to Reddit and not giving them free content to whore out to AI companies for training, but for the millions of normal people who might get value from comments it's really frustrating.

There are tools to mass-edit all your reddit comments and it's incredibly frustrating to see when people do it. I've thought I finally found the answer to some question or technical problem or whatever in a reddit thread, only to then see the original post replaced with something like "This comment was removed because Reddit made me angry. Lorem ipsum dolar sit amet shit." Perhaps unfair but it makes me hate that person's selfishness much more than make me dislike Reddit.

I live in Utah and get to witness this first-hand. Just yesterday it was windy enough that unpleasant dust clouds were coming off the dried parts of the lake bed. Utah snowpack is at a record low this year and peaked for the 2026 water year earlier in March. We broke several high temperature records this month (along with a bunch of other states in the west / mountain west). It's looking pretty bad.

Right now it's a lot like watching a slow-moving train derailment. Everyone knows what's coming, but 80% of the population, the majority being Mormon religious nuts, rationalizes it away or refuses to acknowledge it, but those that do see the problem won't take action to address it, preferring instead to "hopes and prayers". Brian Cox, the damned governor, has declared multiple "days of prayer for rain".

There's a sick fatalism amongst many religious groups, assuming that God won't let terrible things happen to them, but it's especially bad with Mormons. They think they're a chosen people, living in a chosen land, and that the "end times" are coming soon. All this adds up to "I don't need to do or sacrifice anything to deal with Problem because God won't let me suffer and it doesn't matter because the world is going to end soon anyway."

For any rational thinking person this is disgusting, but when 90% of the legislature, the governor, and all US congressmen are owned (mentally and financially) by the Mormon church, there's not much we can do. At best voting them out just gets a different lizard in the seat.

Grok was constantly say it was doing something that it had ZERO ability to, and I kept calling it out and it kept apologizing and then immediately doing it again.

As a guy who spend 5 figures a year on Ai, the last thing I want is that. I know Claude and ChatGPT also do it, but Grok was doing it CONSTANTLY.

Yes?

As for the one in New York, I'll give you three guesses where La Liberté éclairant le monde was made.

Damn science believers, always messing up people's fantasies.

Have you ever seen a shiny new penny versus an old tarnished one? Or the Statue of Liberty? Or an old building with one of those weird green roofs?

They're all copper, with varying amounts of oxygen. Oxygen free copper is expensive copper that's specially made to get rid of as much of the oxygen as possible: https://en.wikipedia.org/wiki/...

If the article got something so simple as THIS completely wrong, one can easily presume that the REST of the article is incorrect gibberish.

"oXyGEn-fREE cOppER", lmao

Indeed.

You can of course have it delivered to your door as well. If you can't receive it at home, as is the case being discussed in this thread, then you can have something delivered to a locker. When you go to pick it up you tell Amazon you're there and they pop open the correct door.

It's interesting how practically everything is "the most convincing proof we have."