Physicists use the Navier-Stokes equations to describe fluid flows, taking into account viscosity, velocity, pressure and density. But because of turbulence in fluids, proving that the equations always make sense is one of the hardest problems in physics and mathematics. Read about the episode here: https://www.quantamagazine.org/why-turbulence-is-a-hard-physics-problem-20190128/ Directed by Emily Driscoll and animated by Qais Sarhan for Quanta Magazine https://www.quantamagazine.org/ Facebook: https://www.facebook.com/QuantaNews Twitter: https://twitter.com/QuantaMagazine Sign up for our weekly newsletter: http://eepurl.com/6FnWj