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Warm Dark Matter(WDM), considerably clarifies and simplifies galaxies andgalaxy formation in agreement with observations. WDM essentially works,naturally reproducing the astronomical observations over all scales, small(galactic) as well as large and cosmological scales.Evidence that CDM,CDM+baryons and proposed tailored cures do not work in galaxies is staggering,The Chalonge Meudon Workshop 2012 approached DM in a fourfold coherent way:astronomical observations (galaxy and cluster properties, haloes, rotationcurves, density profiles, surface density), LambdaWDM N-body simulations, WDMtheory (Boltzmann-Vlasov evolution, halo mass functions, halo models, improvedperturbative approachs), quantum WDM fermions forming the observed cores, WDMparticle and nuclear physics (sterile neutrinos) and its experimental search. NAmorisco, P Biermann, S Das, H J de Vega, A Kamada, E Ferri(MARE),I DKaranchetsev, W Liao, M Lovell, M Papastergis, N G Sanchez, P Valageas,CWatson, J Zavala,He Zhang present their Highlights.Inside galaxy cores, N-bodyclassical physics simulations are incorrect for WDM because of importantquantum effects at such scales.Quantum WDM calculations (Thomas-Fermi) providegalaxy cores, galaxy masses, velocity dispersions and density profiles inagreement with observations.Baryons (16% of DM) are expected to give acorrection to pure WDM results. The summary and conclusions by H. J. de Vegaand N. G. Sanchez stress that all evidences point to a DM particle mass around2 keV. Peter Biermann in his live minutes concludes that a few keV sterileneutrino is the most serious DM candidate. MARE -and hopefully KATRIN- couldprovide a sterile neutrino signal.There is a formidable WDM work to performahead of us, these highlights point research directions worthwhile topursue.Photos of the Workshop are included (Abridged).

Towards the Chalonge Meudon Workshop 2013. Highlights and Conclusions of  the Chalonge Meudon workshop 2012: warm dark matter galaxy formation in  agreement with observations