The purpose of this research blog is to engage humanities and social sciences scholars in a dialogue with material scientists with a view to better characterize the hybrid life of materials as natural entities and social or economic agents. In order to impulse a collaborative interdisciplinary research network focused on humans’ interactions and interdependencies with materials today and in the long-duration history, this blog gathers the contributions of scholars from a wide spectrum of research fields who are exploring the temporalities of material and exploring topics such as : o lifetimes, lifecycles, use, trajectories, persistence, endurance, ageing o depletion, peak, criticality, erosion, alteration, degradation, conservation o re-use, remaining, recycling, returns, inheritances, rivalries, substitutionso birthdays and anniversaries, death, decline, rebirtho genealogies, time travelo ephemerality, regimes of temporality, mimetism o ages, epochso chronomarkers, signatures, records and measurements