Baghdad Battery

Clay jars that hold a charge. Someone had electricity two thousand years early.

Terracotta jars with copper cylinders and iron rods (Parthian/Sassanid era, near Baghdad) that produce ~0.5V when filled with acid — demonstrated in replications. Whether they were batteries (electroplating? electrotherapy?) or just scroll containers is unresolved; no wires or plated objects were found with them. The node anchors the out-of-place-artifacts file and links to Tesla as the archive's 'lost electrical knowledge' bookends.