So,
octopoid_horror asked if my new ceramic knife could be smuggled onto planes.
And I wondered how I could tell if a metal detector would be able to pick it up (short of finding some magnets and waving them at it carefully.
And then
draxar pointed out that I could download a metal detector for my phone.
Because it has a compass built into it, and can thus tell when metal objects are being waved at it.
And it worked perfectly (and no, I cannot smuggle my kitchenware onto flights).
And suddenly I feel even more like I'm living in Star-Trek.