The biological world operates on a multitude of scales - from molecules to cells to tissues to organisms to ecosystems. Throughout all these levels runs a common thread: the communication and onward passage of information - from cell to cell, from organism to organism and, ultimately, from generation to generation. But how does this information - no more than a static repository of data - come alive to govern the processes that constitute life? The answer lies in the concerted action of molecular components which cooperate through a series of carefully-regulated processes to bring the...