Time 'paradoxes' in relativity / Dennis Sciama -- Space, time and space-time : a philosopher's view / W.H. Newton-Smith -- Big bangs, black holes and "time's arrow" / Roger Penrose -- Time and cosmology / Michael Shallis -- Time and dispersal : the second law / P.W. Atkins -- Time asymmetry and quantum mechanics / Paul Davies -- The open future / J.R. Lucas -- Causal loops / M. Dummett