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Comment Re: Not terrible, which is too bad (Score 1) 75

Though realistically, because 240Pu (from waste) is worse in a fission bomb than 239Pu - generally no more than ~20kT, and challenging to get more than a few kT - still enough to take out a city centre but not a metro area - you'll generally want a fusion weapon, which means deuterium and tritium supplies. And Ukraine doesn't run CANDUs, so you're not going to get tritium from the coolant. They'd need lithium targets / lithium in the coolant to breed tritium. Separation of tritium and deuterium are a mix of chemical, electrochemical, and/or physical separation, but are much easier than uranium isotopic separation (deuterium is double the mass of protium, and tritum triple the mass, so the chemical / electrochemical behavior is actually notably different in a lot of situations, unlike uranium).

For a fusion bomb they'd also want a depleted uranium tamper, but Ukraine probably has ample access to that, whether from weapons, armour, old Soviet stocks, etc. Even spent nuclear fuel is mostly 238U, if they don't mind the tamper being highly radioactive.

Comment Re:Nvidia's loss (Score 1) 88

Sure, but there's at least two kinds of luck, the kind that comes after doing something smart, and the kind that comes after fucking up. Shouldn't we give people credit for the first kind, where (for this example) they bet on reconfigurability and reusability?

For me the question is, whose idea was it, did he have to be talked into it, etc.

Comment Re: Not terrible, which is too bad (Score 1) 75

My personal best guess would be that Ukraine's unstated policy is to have "sprint capacity", like Japan and South Korea do. That is, to not make weapons or anything that would get them flagged as having a weapons programme, but to have everything needed that, if the word "Go" was given, that they could nuclearize very quickly.

Unlike your typical rogue state that seeks to get nuclear weapons, Ukraine has no need for mass centrifuge facilities or anything like that. They already have plutonium en masse, as they're a major nuclear power generation state with extensive waste supplies. Plutonium extraction via PUREX is merely metallurgy (it's not a simple metal to work with, but it doesn't require isotopic enrichment). You need nitric acid (bog standard, nobody will blink an eye), a reducing agent like ferrous sulfamate (not much of a red flag, it has tons of uses), and an organic solvent like tributyl phosphate (a little bit of a red flag, but it has other uses, and there are alternatives), and a bit of gallium (~1%) for alloying - not a problem. Ukraine could very readily have all of this on-hand, an underground lab ready to go, and a rolodex of people to staff it if the order is given. They'd need high explosives like PBXs or TATB, but nobody would blink an eye at Ukraine buying them. High speed switches for the detonators used to be a big red flag item, but today they increasingly overlap with power electronics for motors and power grids. You need neutron initiators, but there's a number of options for that. And running bomb physics simulations and doing small component tests is something they could easily have under the radar - if they don't outright have old Soviet design plans dusted off and ready to go.

The biggest red flag would be Ukraine inexplicably removing nuclear waste (for processing) and/or trying to defeat IAEA monitoring, so that would likely be not done unless nuclear tensions looked severe. Because if it looks like you're sprinting to a nuclear weapon, it increases the odds of a preemptive nuclear strike against you.

Comment Re:Nvidia's loss (Score 1) 88

I think you're downplaying #1 a bit, no quibbles about #2 though.

I don't know if Huang deserves all of the credit for the direction, but if he does, then I think he deserves a lot of credit for that. CUDA is brilliant because they have been able to move their existing system forward on it, for example by rebasing PhysX on it and thereby not having to reimplement that.

Comment Re:Things are going to get pretty messed up soon (Score 1) 40

Copyrights and Patents ought to be taxed by the holders of those protected classes. Choosing to not pay those taxes liberates those patents and copyrights to the public domain.

That's kind of how it works, except all the terms are different. Choosing not to go to court about it etc etc. No matter what it's choosing whether or not to spend the money.

This is the one kind of tax that I can get on board with, because it is 100% voluntary and doesn't force anyone to do anything.

But it does. Copyright is still backed up by rough men with guns.

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