You forgot the "great" Navier Stokes equations. In 1932 Sir Lamb, in an address to the British Association for the Advancement of Science, wittily expressed on the difficulty of explaining and studying turbulence in fluids. He reportedly said, "I am an old man now, and when I die and go to heaven there are two matters on which I hope for enlightenment. One is quantum electrodynamics, and the other is the turbulent motion of fluids. And about the former I am rather optimistic."