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Journal Journal: Kapla: Spirals

Just building stuff, sometimes continuing the following week: Week 1 Week 2

The booklet had a spiral which took some time to figure out. Basically, 2 pieces in the middle, and 1 on each side of it, which makes it look really cool, and more importantly, supports the turned pieces. They do a slow turn though.

Comment Re:Related puzzle - explain this to me? (Score 1) 213

Rotating with respect to itself. Every particle in that space station (assuming it's rotating) is under tension, experiencing a net force and hence a net acceleration. Let a bit go, and it'll fly off in a straight line. (At that point, the particle could argue that it's at rest, and the space station is both rotating and moving linearly, because the particle *would* be in an inertial reference frame.) You don't need a reference frame to measure force, just velocity.

As for whether observing a rotating object implies that "something" must have accelerated it in the past, that's a question for the philosophers.

Comment Re:Related puzzle - explain this to me? (Score 1) 213

Hmm? Sure. A rotating space station is a non-inertial reference frame, in the sense that objects in it are undergoing acceleration (caused by the tensile force holding their particles together). So you can just measure the apparent centrifugal force at a particular radius, do a little math, and find out the angular velocity of each ring. Or you could just jump off the stations. As you floated away into the void, you'd see whichever ones were rotating, rotating. (Better bring a radio, so you can tell the rest of us. Or a rope, I suppose.)

Comment Comparing apples to fried oranges (Score 3, Informative) 157

In an attempt to test whether the higher numbers of cardiovascular deaths were simply a statistical blip or a genuine sign of the effect of traveling into deep space, the scientists exposed mice to the same type of radiation that the astronauts would have experienced. After six months, which is the equivalent of 20 human years, the mice showed damage to arteries that is known to lead to the development of cardiovascular disease in humans.

Well, no. The scientists slammed the mice with ~6-12 months' worth of radiation in ten minutes. Yeah, they probably had artery damage. Stuff like that happens when you stick a mouse in the microwave.

Comment Re:Expected (Score 5, Informative) 134

The problem again is LastPass. Nobody knows if their security practices are any good, and the attack surface is huge.

Well, their online security practices are relatively unknown, but they're also kind of beside the point. Yes, LastPass won't hand out someone's vault without some sort of authentication, but that's just fences around brick walls. The real means of security is in the client, which is the only part capable of decrypting the vault (decryption keys never being uploaded). The client source code is available and has been audited, so you can feel pretty good about that, short of the Ken Thompson hack or the possibility of the local computer itself being hacked (which, of course, would affect any password manager).

Comment Re:What salvageable hardware is in there? (Score 1) 140

Stripping it for parts? Well, there's a HD and a BluRay, of course, and a fan, and some cables; those would be worth a few bucks put together.

Beyond that there's a couple of circuit boards with lots of chips soldered to them. If you have a BGA rework station and a steady hand, you could recover the ICs. But if you're looking for a graphics card, a socketable CPU, memory DIMMs... you're out of luck. There's no reason for MS to make the xbone a PC on the inside, and every reason for them not to.

Comment Re:And if the EU doesn't play along? (Score 1) 194

Zero-risk is kind of a weird strategy for someone holding stock, but okay, whatever. So the stock price finds a lower equilibrium, because people feel that 5G's gonna be an overall negative for the carriers. So what? The carriers still have to deal with it. Whichever one finds the right balance between ramp-up costs and early-mover benefits will do the best, meaning they all have a strong incentive to be that one.

I cannot believe I'm explaining the invisible hand of the market to someone who's arguing *against* government regulation.

Comment Re:And if the EU doesn't play along? (Score 1) 194

As an investor, you're going to support a 5G rollout because if your competitors do and you don't, your portfolio will be well and truly screwed in a few years. Maybe you think the early-mover bonus is going to cover the costs and maybe you don't, but either way you clearly can't afford to hang back. The only real question is what effect it'll have on the rollout *schedule*.

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