  Quasi periodic oscillations (QPO) seen in the X-ray fluxes of individual
neutron stars and black hole sources are one of most intriguing phenomena in
today's astrophysics. The QPO nature is visibly determined by super-strong
Einstein's gravity. I argue here that it also profoundly depends on the MRI
turbulence in accretion flows. Understanding the QPO physics may therefore
guide accretion theory out of its present state of confusion.
