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Does the future already exist in the future? We are used to representing time by a line formed of points similar to those in space. This representation of time masks a formidable problem: when an instant is present, where are the other instants, especially those of the future? Have they existed elsewhere, since the dawn of time, just waiting to become present for a moment, at the moment when time will pass through them? Or do they still lie in nothingness, outside of all reality, to become fleetingly real only at the moment when they will be present? Étienne Klein is a former student of the École Centrale Paris, where he obtained a DEA in theoretical physics. He subsequently completed a doctorate in philosophy of science and obtained an accreditation to supervise research (HDR). He is a physicist at the CEA, where he is currently director of the Laboratory for Research on Material Sciences, based in Saclay.