### The mathematical reason that eggs are sold by the dozen

The world is full of math. Mathematics influences all aspects of life, they slip through all the daily fissures. And knowing how to detect them is a very effective way to unravel some of the threads that move everything, Neo-style in Matrix after glimpsing the Code. Even at a geographical and / or tourist level we can enjoy mathematicians, as on the Moon, where we will find 300 craters with names of mathematicians, such as Laplace, Fermat or Pythagoras.