Wernher von Braun

“The rocket worked perfectly, except for landing on the wrong planet.” Wernher von Braun (comment on V2 landing on London 1944, Apollo in Perspective : Spaceflight Then and Now (1999))

John Strutt, 3rd Baron Rayleigh

“Without encroaching upon grounds appertaining to the theologian and the philosopher, the domain of natural sciences is surely broad enough to satisfy the wildest ambition of its devotees. The work may be hard, and the discipline severe; but the interest never fails, and great is the privilege of achievement.,” John Strutt, 3rd Baron Rayleigh


“You should call it entropy, for two reasons. In the first place your uncertainty function has been used in statistical mechanics under that name, so it already has a name. In the second place, and more important, no one really knows what entropy really is, so in a debate you will always have the advantage.” […]

Ernst Mach

“I know of nothing more terrible than the poor creatures who have learned too much. Instead of the sound powerful judgement which would probably have grown up if they had learned nothing, their thoughts creep timidly and hypnotically after words, principles and formulae, constantly by the same paths. What they have acquired is a spider’s […]

Leonardo da Vinci

“The object that strikes the air develops a force equal to that of the air that strikes the object. Observe how the beating of its wings against the air suffices to bear up the weight of the eagle in the highest and thinnest air. Observe too that, conversely, the air fills the sails and pushes […]

Lucasian Professor George Gabriel Stokes

“I was capable of being moved, mathematically, as it were, by the belief that a particular course was right; and I do believe that God put these views in my mind, working by means of that which was in me to supply that which was wanting,” Lucasian Professor George Gabriel Stokes “Then it is right […]

Leonardo da Vinci

“The great bird will take its first flight on the back of a great swan; filling the universe with wonders; filling all writings with its fame and bringing eternal glory to the nest from which it came,” Leonardo da Vinci


The Reynolds equations are still a riddle. They are based on the Navier-Stokes equations, which are still a mystery. The Navier-Stokes equations are a viscous regularization of the Euler equations, which are still an enigma. Turbulence is a riddle wrapped in a mystery inside an enigma. ~Constatin, P. “Euler equations, NSE and turbulence,” Mathematical Foundations […]