The Iron Pillar of Delhi hasn't rusted in 1600 years and that's the real OOPART

Forget lightbulbs. The thing that actually keeps metallurgists up at night is sitting in a courtyard at the Qutb complex in Delhi. The Iron Pillar. ~7m tall, ~6 tonnes of wrought iron, raised around 400 AD, Gupta era, there's a Sanskrit inscription crediting a king Chandra (probably Chandragupta II)……