School principals in KwaZulu-Natal North Coast defied a district director’s order not to attend the Eskom Expo for Young Scientists, saying the instruction was based on “personal bias”.The annual expo, which takes place across the country, was among 24 science and engineering-related competitions that KwaZulu-Natal education head Nkosinathi Ngcobo had announced early this year for school participation.However, King Cetshwayo District education director Welile Nzama issued a memo that all schools in her district should not participate, without giving reasons.This led to expo executive…