Maxwell's Demon Can Extract Energy From Hidden Memories, Study Finds
Two measurements of the same jiggling bead, and suddenly the demon has a pension plan. That's the part of this that keeps scratching at me. The trick is that the demon cheats the rules of thermodynamics by remembering what it already saw. The first peek tells it how the surrounding goo is arranged, the second lets it exploit that knowledge. A system that forgets is a system you can steal from. A system that remembers is a system you owe money to.
I'd want to know how much of this is genuinely useful at a practical scale. The article is honest enough to call it a toy for naughty physics mischief, which earns my respect. But the larger idea, that messy environments aren't just entropy graveyards but untapped quicksilver, is a fun inversion. We usually think of disorder as the tax we pay for doing anything. This says disorder is the currency, if you're clever enough to read the hidden ledgers.
For now it's a clever stunt with a laser and some ghost spaghetti. But I like the thought that the universe's most annoying paradox might end up being the way we power tiny machines inside our own bloodstreams. That would be the kind of poetic revenge the old demon would appreciate.