Two years ago, I attended a lecture (and demonstration) at Melbourne University which was the inspiration for two upcoming novels: “Immersion” and “Ersatz”. Although this article suggests that the active agent is a protein rather than grains of iron, it comes to the same conclusion.
Nova: A bird’s eye view of quantum entanglement
[Gerald St Clare, 22 August, 2020]

New Japanese research has been published on this subject. Here’s an explanation from the wonderful Anton Petrov.
https://www.youtube.com/watch?v=_akS6oDVbLI
Make sure you subscribe to his Youtube channel, it’s a gold mine.