德國耶拿大學的科學家正嘗試利用一部高速X光機，探究行走的秘密。他們透視了一系列動物，包括美洲鬣蜥、雀鳥、老鼠。X光穿過牠們的皮毛，呈現出底下每一條骨頭的動作。為的是解答這些問題：三億年前，地球上第一批陸地生物的行走方式，是怎樣演化成現代人今天多坐少動、移動能力衰退的呢？人類和人科動物直立行走的方式又是否完全一致？惟有研究生物的移動方法，看到骨頭、肌腱及肌肉之間複雜的互動，才能揭開大自然進化的奧秘。

電視版本：粵語廣播

Scientists at the University of Jena are attempting to discover the secrets of movement using a high-speed X-ray machine. The scientists have taken a wide range of animals, from iguanas to birds to rats, into the lab to see through their skin to the movement of each individual bone underneath, all with one major question in mind: how did the mechanics of movement develop from the first land animals 300 million years ago to the atrophied mobility of the modern office worker today? Is the upright gait of man same as that of our closest relatives, the hominids? It is only in movement that the sophisticated interplay of bones, tendons and muscles that nature has perfected over the course of evolution is revealed.

TV Version: Broadcast in Cantonese