Introduced by John Tidmarsh
The winners of the four heats return to the BBC's Birmingham studios for The Final
The trophy of the Royal Institution will go to one of these schools:
Loughborough Grammar, Leicestershire
Yeovil College, Somerset
Bellshill Academy, Strathclyde
St Fanchea's, Enniskillen, Co Fermanagh.
The projects offer: electronic aids for nurses; improved kidney dialysis machines; an answer to iron pollution and a way to make the home fires burn more clearly.
The judges:
Professor Colin Blakemore, Oxford University
Dr Josephine Douek, South Bank Polytechnic, London
Professor Sir George Porter, Royal Institution
Heinz Wolff, Medical Research Council
Seven additional cash prizes will be awarded for special qualities displayed by some of the 13 projects shown in this series.