All living beings are made up of tiny microscopic units called cells. Some, like primitive organisms found in ponds, consist simply of a single cell. Others, like humans, begin life as a single cell, but grow into a vast complex of many different cell types, with each cell performing a specialised function. While towns and cities vary greatly in size, no matter where they are in the world, they share many similar features. Likewise, despite the vast variety of life forms and cell types, different shapes and sizes, all cells have many features in common.

This series concentrates on animal cells, but most of the same basic structures and organising principles apply equally well to cells in plants as they do to cells in humans. Travel from outer space on a journey of discovery, into the depths of a single cell.

所有的生物都擁有相同的物質基元，就是細胞。觀看人類如何組織生活，似乎與細胞好像沒有關連，但細看城市裡的各項活動與細胞功能又極為相似。本系列以我們熟悉的城市為比喻，探索細胞的結構及組織原理。備有中文字幕。

1. CITY LIFE
城市生活：細胞結構
A cell's function is similar to that of a city. The inter-relationship between cells is explored, and the analogy applied to gain a deeper understanding of cities. With its outer boundaries, power stations, factories, post offices, roads and communication networks, a biological cell is similar to a city in microcosm. 30 mins.

細胞的功能就如運作中的城市，邊界，發電站，工廠，郵局，道路，交通網絡，細胞裡都有相同的結構和活動。備有中文字幕。

2. CITY WORKS
城市運作：細胞活動
Likening the inner workings of cells to a city, this programme uses this fun yet robust analogy to investigate cell division and cancer research. 30 mins.

無休止的城市虛耗大量能源，發電站不停運作供應能源給城市，原來細胞裡也有一個名為粒線體的細小發電站，提供動力給大部份細胞活動。細胞不斷擴展為此要進行細胞分裂，但萬一失控，細胞行為異常就會產生癌細胞。備有中文字幕。

3. INNER CITY
市區中心：細胞緊密運作
A cell's function is similar to that of a city. With this in mind, the inter-relationship between cells is explored, and the analogy applied to gain a deeper understanding of diabetes, stem cell research and ageing. 30 mins.

觀察城市有助了解細胞功能，城市時刻監察自己的經濟狀況和環境，並需要與其他城市交換資料。人類體內的細胞每當出現問題也會跟相鄰細胞互換資料。本節目深入介紹糖尿病，幹細胞及年老的問題。備有中文字幕。

4. CANCER PIONEERS
細胞週期基制：研究貢獻
Unless we understand how cells work, we can never understand why they go wrong, and that means we will never properly understand disease such as cancer. Also, understanding basic cell processes will really help us tackle important human diseases. This programme looks at the landmark work of Sir Paul Nurse, Tim Hunt and Lee Hartwell - winners of the 2001 Nobel prize in medicine. 14 mins.

科學家致力對細胞進行研究，但至今對細胞為何出現不正常運作仍有很多未解之謎。二○○一年諾貝爾醫學獎的保羅納斯爵士，添亨特博士及李哈特韋爾博士在節目內親自分享他們對細胞週期與癌細胞形成的基制的理論。備有中文字幕。