Prominent scientists and philosophers of science address contemporary debates on the nature of time. Their contributions freely discuss its unity and reality, its compatibility with the orders of classical philosophy (present, past and future) and with the disputed idea of free will (volume 1). They also present a detailed and updated state of the role of time in the so-called exact sciences: biology - or more precisely genetics, evolution, neurosciences, natural and artificial intelligence (volume 2) , and physics - relativity, quantum mechanics and quantum gravity, and cosmology (volume 3).