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It is a relatively new phenomenon that is usually determined in experiments through spectroscopic characterization of the roaming products. Using a combination of time-resolved Coulomb explosion imaging and quasiclassical trajectory analysis, Endo\n                    <jats:italic>et al.<\/jats:italic>\n                    report real-time observation of individual fragments of the prototypical reaction of deuterated formaldehyde (D\n                    <jats:sub>2<\/jats:sub>\n                    CO) dissociation as they roam on ultrafast time scales. 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