Not a showstopper, but definitely a problem that needs to be addressed.

It's not per se a deadly amount of radiation, but it does increase the astronaut's risk of cancer. A quick calculation once suggested that a trip to Mars and back would give you an increased risk of cancer roughly equivalent to smoking a pack of cigarettes a day. Robert Zubrin once quipped that the answer is simple: pick astronauts who are smokers... and don't send any cigarettes with them.

To the contrary, this has been analyzed a lot, and there are many ideas for how to stop it. With respect to the current topic, one idea is simply to use a more effective engine, and make the trip faster to shorter the exposure.

Really there are two types of radiation to worry about. One is solar protons (coronal mass ejections, or "CME"s), and the other is galactic cosmic rays ("GCR"s).

That, at least, is a solvable problem. The protons from a solar flare can be seen in advance, and last only a day or so. You can make a small portion of the spacecraft a "storm shelter" with enough shielding to stop protons (light elements are best for stopping protons; water, for example, is a great dhielding material. GCRs are harder to stop). It would be too heavy to shield the entire ship, but the astronauts can stay in their shelter for a day or so. GCRs you simply have to live with. This risk is cumulative, so the solution is to go as fast as possible.

Protecting electronics is something we already know how to deal with. We have robotic probes that have been operating for literally years in deep space, not to mention one probe that routinely dips into the ferocious radiation environment of Jupiter's radiation belts.

You got it. They ignited a plasma. They did not ignite a fusion reaction.

Igniting a plasma isn't hard. I do it every time I turn on a fluorescent light (but not a high temperature plasma).

It is a start, bravo for them. But it's only a single step on a very very long journey.

The main safety issue with plug-in solar is that the solar panel must not feed power to the grid if there's an electrical outage. This is because repair crews for the utility company need to be sure that there isn't power coming in from the user side when they're repairing the producer side.

The Utah bill referenced (https://le.utah.gov/~2025/bills/static/HB0340.html) includes that explicitly:
(2)A portable solar generation device shall include a device or feature that prevents the system from energizing the building's electrical system during a power outage.

So, I'd think that as long as that is built into the system, and assuming it passes UL standards for consumer safety, I think the safety issue should not be a problem.

...but no guarantees.

No minus sign in front of the productivity change.

three and a bit = 011 + 001 = 100.
Four.

I notice your reply has no information content whatsoever.

That is, of course, accurate. Nuclear power is a low carbon-dioxide emission energy source, but it is literally not renewable (since it mines uranium for fuel, and uranium does not renew itself.)

In principle, it could be hundreds or even thousands of years before the supply of uranium is a problem, if we used the uranium efficiently, but with today's reactors, with no fuel reprocessing and no breeder reactors, if we used nuclear for all the electrical generation in the world, we would run out in a few decades.

That's the tl;dr summary of the summary, yes.

Totally, painfully right. As of today, yes, fossil fuels still dominate energy consumption in sectors such as transport.

Maybe. That's speculation about the future. The comment you're replying to is the present-day reality.

Manufacture of synfuels is an energy-intensive process (and typically the carbon source is from fossil-fuel sources such as coal...but, the good news is, coal is not sourced from Russia). Not clear if it will ever be commercially viable, or ever be carbon-neutral.

I'd place my money on electric vehicles to reduce oil requirements, not synfuels.

Wait-- you have personally observed cases of people engaged in a folie au deux fed by an AI agent?

The AI large-language model doesn't know that the real world exists. It doesn't know that fiction is different from reality, because it doesn't actually know about reality.

It put together a large fictional world, in which fictional things happen to characters that did not, actually, turn out to be fictional.

Since the employee was not identified, this looks like correct use of the English pronoun "they", which is the grammatically correct usage when the identity of the person is unknown.
"Someone left their wallet at the checkout."

Do you know that? It's a Hollywood cliche, sure, but there are nine countries with nuclear weapons on the planet, and they don't disclose their safety protocols.

DNA testing is a statistical test. There is always the possibility of a false positive.