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If pre Inca civilization in Peru invent hot air balloon in 1500 BC.
Reverberatory furnace look like as hot air balloon in Reverse. that can lead to bronze smelting in 1000 BC instead of 0 CE. they can learn to make proper ship instead of balsa raft. they could model their ship on figure of hot air ball0on
could pre Colombian civilization of 1000 CE rival old world bronze civilization of 2000 BCE ?