"And we have a billion compass needles, which could make for ... the company FieldLine Inc. that manufactures atomic vapor magnetic sensors, also called optically pumped magnetometers (OPMs).

Primarily, the compass was used for geomancy for a long time before it was used for navigation Ancient Chinese alchemists realized that the magnetite ore would point towards a magnetic north. Their ...

Magnetotactic bacteria synthesize magnetic iron nanominerals, which function as tiny compasses that allow the microbes to navigate using Earth's geomagnetic field. Earth's iron cycle is a very ...