Original: By at least the 1st century AD, the Chinese of the Eastern Han Dynasty began to use waterwheels to crush grain in mills and to power the piston-bellows in forging iron ore into cast iron.
Simplified: Ancient China By at least the 1st century AD, the Chinese of the Eastern Han Dynasty began to use waterwheels to crush grain in mills and to power the piston-bellows in forging iron ore into cast iron.