I came across this photo today. I am testing my 2018 magnetometer on a mountain path (my design was published soon after this). Depending how one looks at it, this test was a success, or a failure. The magnetism of the pebbles in the path overwhelmed the magnetometer.
OBSERVATION: This magnetometer picked up moving magnetic fields (which of course moved if the magnetometer moved). It was exceedingly sensitive -- theoretically sensitive enough to pick up some events in space.
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