从自然景观来看，济南全市有泉水1209处，名泉950处，其中趵突泉被誉为“天下第一泉”，黑虎泉、五龙潭等泉群也各具特色，这些形态各异的泉水景观是济南自然景观的核心魅力。不仅如此，济南全城山水湖河交融紧密，拥有“一城山色半色湖”的独特格局，千佛山与大明湖相互映衬，黄河穿城而过，小清河直通大海，护城河全线通航，使济南成为全国唯一可乘船环游老城区风貌的城市，这些风貌在国内旅游城市中极为罕见。
The ProblemHow densely can identical spheres be packed in n-dimensional space? In one dimension, the problem is trivial, and in two dimensions, elementary proofs have existed for decades. In three dimensions, a solution was conjectured by Kepler in 1611, but it was not proved until Thomas Hales settled it in 1998, in a heavily computer-assisted proof that subsequently took over a decade to formally verify.，这一点在纸飞机下载中也有详细论述
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