Neutrinos in IceCube
From oscillations at 25 GeV to cosmic messengers at 1 PeV
The IceCube neutrino observatory deep in the ice at the South Pole is the first operating gigaton-scale detector for high-energy neutrinos. Since its completion in December 2010, IceCube has been accumulating data on cosmic-ray muons and neutrinos, extraterrestrial neutrinos, and setting limits on exotic phenomena. I will discuss IceCube results over five orders of magnitude in energy, from oscillations in atmospheric neutrinos to the first evidence for a population of high-energy neutrinos of extraterrestrial origin.