The XXVII. Mazurian Lakes School of Physics was mainly devoted to four different topics: (i) Medium modifications of the nucleon--nucleon interaction and the nucleon--nucleon cross-section, medium dependence of hadrons masses and the equation of state of nuclear matter studied in heavy ion collisions. (ii) Nuclear astrophysics with a special emphasis on cosmic ray's. (iii)New developments in neutrino physics. (iv) Future plans for the GSI in Darmstadt and the first results from RHIC in Brookhaven. I have to excuse, but I will due to time reasons not summarise the shorter evening seminars and I will only shortly mention the talks of this Saturday morning.

PACS numbers: 14.60.Pq, 96.40.--z, 25.75.--q, 26.50.+x