德国耶拿大学的科学家正尝试利用一部高速X光机，探究行走的秘密。他们透视了一系列动物，包括美洲鬣蜥、雀鸟、老鼠。X光穿过它们的皮毛，呈现出底下每一条骨头的动作。为的是解答这些问题：三亿年前，地球上第一批陆地生物的行走方式，是怎样演化成现代人今天多坐少动、移动能力衰退的呢？人类和人科动物直立行走的方式又是否完全一致？惟有研究生物的移动方法，看到骨头、肌腱及肌肉之间复杂的互动，才能揭开大自然进化的奥秘。

电视版本：粤语广播

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