Issue 400, 21 April 1997 Main news stories Royal seal of approval for life-saving invention Nitrate clue to childhood diabetes Security campaign Moscow connection Panel develops industrial partnership The mosquitoes are coming - if we're lucky Short on size - big on speed 20th anniversary celebration Obituary   Letters - News in brief - Events - Ads - Noticeboard - Back Issues Search this issue - all issues Info - Feedback/comments - University of Leeds