 Newton's Law of Motion describes motion of particles Maxwell's equations describes electromagnetic radiation Navier-Stokes equations describes fluid motion Heat equation describes heat flow Wave equation describes wave motion Schrödinger equation describes atoms, molecules and crystals Stress-strain equations describes elastic materials Black-Scholes models used for pricing financial options Predator-prey equations describes ecosystem populations Einstein's equations connects gravity and geometry Ludwig-Jones-Holling's equation models spruce budworm/Balsam fir ecosystem Zeeman's model models heart beats and nerve impulses Sherman-Rinzel-Keizer model for electrical activity in Pancreatic $\beta$-cells Hodgkin-Huxley equations models nerve action potentials