I said, "We didn't pass through each other because elementary particles have mass and because the space between elementary particles is filled with the binding energy that also has the properties of mass, and we've known that for 800 years." She must have been in one of those moods where she likes to mess with strangers.
Dije: "No lo hicimos porque las partículas elementales tienen masa y el espacio entre ellas lo ocupa la energía de enlace que tiene las mismas propiedades y sabemos esto desde hace 800 años".