the.com/bellows
the lung that never tires, breathing fire into iron until civilization caught spark
forge engineFueled smelting that built the entire Bronze Age
pipe organMassive bellows give cathedral organs their roaring voice
foot-poweredBlacksmith versions freed both hands for hammering
frog anatomySome frogs breathe by pumping throats like living bellows
word originOld English for belly, the thing that swells