Astrophysical Tau Neutrinos
Neutrinos are very reticent fundamental particles. Tau neutrinos make electron and muon neutrinos look
positively gregarious. The IceCube Neutrino Observatory at the South Pole has sensitivity to all three active neutrino
flavors over an energy scale spanning six orders of magnitude. We report on the first high-significance measurement of
the most energetic tau neutrino candidates ever observed.