During its first three years of operation, the Fermi Gamma-ray Space
Telescope has provided an unprecedented view of the high energy gamma-ray sky,
and also performed direct measurements of the cosmic-ray leptons and searches
for signals from dark matter. In this paper we present a short overview of some
highlight results, shedding new light on the high-energy side of the Universe.Comment: Contribution to Les Rencontres de Physique de la Vall\'ee D'Aoste (La
Thuile, February 27-March 5 2011); 12 pages, 5 figure
