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The properties of strange hadrons, i.e. of kaons and hyperons, in the nuclearmedium are discussed in connection with neutron star properties andrelativistic heavy-ion collisions. Firstly, the relevant medium modificationsof a kaon in a medium as provided by heavy-ion collisions is criticallyexamined within a coupled channel calculation. We demonstrate, that particleratios for kaons are not a sensitive probe of in-medium effects while the K-flow is more suited to pin down the K- optical potential in dense matter.Secondly, the interaction between hyperons is studied and may form bound stateswhich can be produced in relativistic heavy-ion collisions. Signals for thedetection of strange dibaryons by their decay topology and/or in the invariantmass spectra are outlined.Comment: 10 pages, 8 figures, invited talk given at the V International  Conference on Strangeness in Quark Matter, Berkeley, California, July 20-25,  2000, to be published in J. Phys.

Effect of in-medium properties on heavy-ion collisions