Presented by John Maddox
How an organism develops from a single cell and how the brain works are the two most important problems of modern biology. Professor E. C. Zeeman of the University of Warwick believes that topology - a kind of super-geometry - may provide a key to solving these problems.
Iron, zinc, sodium, cobalt, copper and magnesium are a few of the metals associated with the chemical processes of life.DrR.J.P.WilliamsofOxford University discusses their evolutionary and functional roles in living cells.
Producer DAVID PATERSON followed by an interlude