SoylentNews is people
SoylentNews
Submitted via IRC for charon
Birds are the best-known example of creatures able to sense magnetic fields and to use them for orientation and navigation. Less well known are the magneto-sensing abilities of American cockroaches, which quickly become magnetized when placed in a magnetic field.
Just how these creatures use this ability is the subject of much speculation. But there is general agreement that a better understanding of biomagnetic sensing could help engineers design better sensors for other applications, such as microrobot navigation.
But before that can happen, engineers will need a far better understanding of how cockroaches sense magnetic fields and how they become magnetized themselves.
Enter Ling-Jun Kong at Nanyang Technological University in Singapore and a few pals who have measured the way American cockroaches become magnetized. In the process, they've made a remarkable discovery—it turns out that the magnetic properties of living cockroaches are strikingly different from those of dead cockroaches. And they think they know why.
The experiments are straightforward. Kong and co placed a series of living and dead cockroaches in a magnetic field of 1.5 kiloGauss; that's about 100 times stronger than a fridge magnet. The team left the creatures in the field for 20 minutes and then measured how strongly they had become magnetized and how long it took for this magnetization to decay.
The results make for interesting reading. The team could easily measure the magnetic field associated with all the cockroaches, alive or dead, as soon as they came out of the external field. The field associated with living cockroaches then decayed in about 50 minutes. By contrast, it took almost 50 hours for the field to decay in dead cockroaches.
That raises an obvious question: why the difference? Kong and co have created a mathematical model of magnetization to come up with the answer. They assume that magnetization is the result of magnetic particles inside the cockroaches aligning themselves with the external magnetic field. When removed from the external field, the magnetization decays because Brownian motion causes the magnetic particles to become randomly aligned again.
Source: https://www.technologyreview.com/s/603616/the-curious-case-of-cockroach-magnetization/
(Score: 2) by VLM on Sunday February 12 2017, @10:58PM
10K legacy gauss is a Tesla. So thats "pretty damn impressive" of a magnet but not quite NMR/MRI or research magnet strength. If you have a legacy "hi fi" that is probably about how strong the woofer magnet is. So not exactly a cheap kids toy but it is also a long way from needing liq helium cooling.
I would imagine a suitably motivated idiot could harm themselves with a 1T magnet, probably by pinching some skin between it and a metal thingy. I think its well into the "hurt like hell" range of embedded shrapnel but probably not at the "pull the shrapnel out of your body" level.
Just something to think about WRT liability lawyers and all that. Its a very powerful magnet and not cheap, but not unusually exotic either.
This is one of those things where given an infinite amount of spare time and some roaches I could whip something up with an arduino to ... generally F with roaches I guess.