So, pushing past them with your gigantic body is easy, but if you were really small, say you were about the size of a water molecule, all of a sudden, it's like you're swimming in a pool of people.
Sobrepasarlas con tu cuerpo gigante es fácil, pero si fueras muy pequeńo, digamos del tamaño  de una molécula de agua, de repente, es como si nadaras en una piscina de personas.