… Writing in Nature Water, Daniele Penna synthesizes information from almost 700 forested watersheds around the globe to understand how forest characteristics control flow pathways. … Structured around eight hypotheses drawn from the hydrological literature, the study examines the pathways, dynamics and controls on water contributing to streamflow in forest watersheds. Some results from the analysis confirm existing ideas: that forest streamflow is dominated by pre-event water (rain that fell prior to the event) moving through subsurface flow paths. However, many results challenge our preconceptions.