A Crookes radiometer is a moderately understood device* that spins when exposed to light.
Market resolves YES if I own and physically possess a functional radiometer at any point this year. Presumably this would be because I (or a market participant) found a working model online.
I've ordered two separate Amazon listings that didn't work, and just got one in the mail from Walmart that also doesn't work. The Amazon listings were nominally different brands, though in practice both shipped from a brand called Dorami that I'm now trying to avoid.
In addition to the implied mana bounty from the existence of this market, I'm also willing to pay $10 to anyone who can point me towards a working model.
*See here for the establishment explanation, but note a dissenting voice on reddit.
1,000Well this style is the one I see most frequently in educational videos, where they do seem to work. So I would recommend trying one of this design. They're on Amazon too:
https://www.amazon.com/United-Scientific-Supplies-RADIO1-Radiometer/dp/B00ES3TYUM
@IsaacKing I've tried direct sunlight, under a lamp, in a room with high light level, and with my phone's flashlight shining on it. No movement at all.