TED_346_The Science of symmetry - TopicsExpress

TED_346_The Science of symmetry symmetry 對稱， 一般籠統的概念， 就是beauty、harmony 和 balance。 但是在數學和科學領域， 它的定義就更精確: ...a symmetry is the property of an object. ...a symmetry is a transformation that leaves that object unchanged. 再看到生物學上的對稱， 人類即為bilateral symmetry， 類似的還有 foxes、 sharks、beetles和 butterflis。 另外還有radial symmetry， 例如 sea urchins and starfish ocean.nationalgeographic/ocean/photos/sea-urchins/ 牠們是人屬於 pentaradial或five-fold symmetry。 但像corals，則是毫無對稱， asymmetric。 對稱， bilateral symmetry和動作 (movement)有關， 有利用動物獵取食物。 科學家可以利用動物的對稱性 重建the tree of life， 以了解生物的演化史。 並做推論， 例如were more closely related to starfish than we are, to say, corals。 https://youtube/watch?v=3drtbPZF9yc

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