magnetised

De-magnetised while hot is not the same as demagnetised by . .

Are they really going to arrest everyone who is found in possession of a magnetised needle?

Bah. Real men program with a personally-magnetised needle and a steady hand.

Some kind of ubend, and the "pellets" are magnetised? say we drop a rocket into this ubend and it redirects the energy back up into space?

Writing bits to a magnetic platter with a magnetised pin? No. The goal is to find the right abstractions - the right libraries/frameworks/patterns etc.

Org/wiki/Wire_recording You magnetise a wire to record; you read the magnetised wire to playback. You run the wire fast to get adequate bandwidth - the linked WP article says 2200 m for one hour of recording.

They are like mini-magnetised marbles. This explains why water has a much higher boiling point than most tri-atomic molecules.

By surrounding the space craft with a magnetised plasma you can make these deflect around it, just like Earth’s magnetic field protects us from the solar wind.

Anything metal can be magnetised. Anything flammable can be set alight.

SSD is not a great long-term archival medium as it's not passively stable in the way that magnetised media is, and it's still much more expensive.

From my readings, one problem they had was engineering large permanent magnets which are usually magnetised using induction which is a bastard off the grid. This pretty knocks motor production on the head.

Timing control systems for magnetised target fusion were impossible but now are doable. Our understanding of plasma has been advancing a lot, simulations are good now, we can control plasmas much better.

I mean, I know about hysteresis loops, but given the size of the storage cells on a hard disk these days, it seemed really unlikely that they're not fully magnetised. If data recovery companies aren't going to even try, then I guess that pretty much confirms it's a myth.

Yes, you can force that with magnets designed for that, but these appear not to be magnetised like that, so if you want to avoid the rotation, you need to do something about it. As I say in my other comment, easy enough to do with non-symmetrical mating surfaces.

I always figured the theory was that if the cell was magnetised twice, you could tell from the magnitude of the resulting field not only its current magnetisation but also its history. I can see how that might be possible based on magnetic properties of real materials.

The screws stick nicely onto magnetised drivers, so that you can screw them into awkward locations, and they're really resistant to stripping the head. In this day and age, you can set the maximum torque on most electric screwdrivers/drills, so there's no need for a drive that intrinsically limits the torque like Phillips drives.

Edit - also, I went and had a bit more of a look and it turns out there is an energy difference between magnetised and demagnetised materials, but it is very small. One thing is that spontaneous magnetization happens and it wouldn't occur if the energy difference was large.

Com/magnetised/sweetjs is a ruby gem for interfacing with sweetjs using ExecJS. The Tilt wrapper would be about 50 lines of code. This is exactly the sort of thing the asset pipeline is designed to do, and the ruby community has been figuring out how to take advantage of the tooling the javascript community is writing for a while now.

Birkeland noticed that an electron beam directed toward a magnetised terrella was guided toward the magnetic poles and produced rings of light around the poles and concluded that the aurora could be produced in a similar way. He developed a theory in which energetic electrons were ejected from sunspots on the solar surface, directed to the Earth, and guided to the Earth's polar regions by the geomagnetic field where they produced the visible aurora.