The Wheel of Fortune
James Burke looks at 2,000 years of human ingenuity, in the fifth of ten historical detective stories. This week he asks: ' What's the connection between the Caliph of Baghdad's stomach-ache and medieval Nuremberg, or between steel clocksprings and gingerbread men - and what does that connection do to our working day? '
Produced by MICK JACKSON , DAVID KENNARD