22 August 2008
Vol 321, Issue 5892

About The Cover

Cover image expansion

COVER Using sunlight to rearrange the chemical bonds of water into hydrogen and oxygen, as in photosynthesis, would constitute a practical way to store solar energy as a fuel. Such an energy source will depend on new catalysts that promote this fuel-forming reaction cheaply and efficiently. (See page 1072. Photo illustration: Paul Montie (images:; Getty Images)