Contents

31 August 2007
Vol 317, Issue 5842

About The Cover

Cover image expansion

COVER Red tide. The molecular core of a family of red tide toxins can be synthesized by heating a precursor of linked rings (epoxides) in water, which promotes a cascading transformation that produces the characteristic ladder-shaped motif. These results highlight water's dramatic effects on reactivity and selectivity in organic reactions. See page 1189. Photo: Pete Atkinson/Getty Images