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Calculated potential energy surface for the chemical reaction O2 + O2 O3 + O. This reaction is only possible if a reactant oxygen molecule has at least 25 quanta of vibrational energy. See the special section on reaction dynamics beginning on page 1875 as well as the Editorial (page 1831), News story (p. 1847), and related Reports (pages 1913 and 1946). [Image: D. Lauvergnat, D. M. Benoit, D. C. Clary, University College London]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)