Turbulence, Current Sheets and Reconnection in Space and Astrophysical Plasmas: Hesse, M., C. Norgren, P. Tenfjord, Y-H. Liu, J. Burch, L-J. Chen, N. Bessho, S. Wang, T. Phan, K. Genestreti, Why is there a reconnection electric field?, Russian Institute for Space Research (IKI), Moscow, 1-3 October, 2018 (Invited talk)