Although kilometer-scale neutrino detectors such as IceCube are discoveryinstruments, their conceptual design is very much anchored to the observationalfact that Nature produces protons and photons with energies in excess of 10^20eV and 10^13 eV, respectively. The puzzle of where and how Nature acceleratesthe highest energy cosmic particles is unresolved almost a century after theirdiscovery. From energetics considerations we anticipate order 10~100 neutrinoevents per kilometer squared per year pointing back at the source(s) of bothgalactic and extragalactic cosmic rays. In this context, we discuss the resultsof the AMANDA and IceCube neutrino telescopes which will deliver akilometer-square-year of data over the next 3 years.
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