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What if this guy's theories were real (http://www.nott.com/Pages/projects.php), and the people of the Nazca culture had actually invented a hot air ballon around 500 D.C.
How could the Andean civilization have used this invention? What would happen when the Spanish (if they still come) get to Peru and find an united empire (if the Incas or other nation still unites these lands) who uses hot air ballons on a daily basis?