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Show Ancient Maya agriculturists agricultur-ists of Middle America perfected per-fected sophisticated techniques techni-ques with only hand labor and sto.ie tools. They built raised fields above swampland, swamp-land, constructed terraces, and dammed waterways, National Na-tional Geograpphic says. The Fokker F-32, the world's first four-engine airliner, carried passengers in unprecedented luxury in the early 1930s. The planes cost $110,000 each and included in-cluded reclining seats with cushions stuffed with rubber balls to give the passenger ; the feeling that he is riding rid-ing on air." |