School Science Review number 308

Number 308 - March 2003

Contents	Article
7	Editorial
9	Letters
19	Science notes
42	The discovery of DNA
45	Using the Internet for dazzling DNA teaching Harry A. Mazurek
49	DNA for real: learning about PCR in science centre workshops Anna Jollife
57	DNA in the school curriculum – a poorly exploited asset? Nicky Souter
65	The discovery of the double helix: a brief history of the MRC Laboratory of Molecular Biology John Finch
75	Franklin and Wilkins – the forgotten pair? Jonathan Osborne, Mick Nott
81	Examining the mismatch between pupil and teacher knowledge in acid–base chemistry Sibel Erduran
89	Students’ understanding of acid, base and salt reactions in qualitative analysis
99	Responding to alternative conceptions in the classroom Keith S. Taber
109	Children’s perceptions of school science Colette Murphy, Jim Beggs
117	Talk, action and visual communication in teaching and learning science Phil Scott, Carey Jewitt
125	Contents
140	Notes and news