Neutrinos from a blazar jet and the birth of non-stellar neutrino astronomy

IceCube has recently reported the discovery of high-energy neutrinos of astrophysical origin, opening up the PeV (10^15 eV) sky. These observations have triggered a fruitful collaboration across particle and astro-physics. Two years ago some very high-energy IceCube neutrinos have been associated with the blazar TXS 0506+056. I will discuss these results, show that TXS 0506+056 is not what it looks like, and conclude with an outlook. The talk is self-contained and requires no previous knowledge of neutrinos or blazars.