Living beings are made of atoms, and we know that atoms were created at a stage in the evolution of the universe when living beings did not yet exist. Atoms are therefore still present inside living beings, but what's more, they continue to live their life as atoms, with their own way of functioning and with their own properties. In the same way, the stage of the universe that preceded the birth of atoms would still exist, and it would still function inside atoms in the same way it did before atoms existed, just as atoms function within us in the same way they did before living beings appeared.According to this hypothesis, the pre-atomic universe would not be the frightening pre-Big-Bang world we are usually presented with, i.e. a universe subjected to unheard-of conditions of density and heat. This earlier universe would still be living inside us, in the atoms that constitutes us, and under the conditions of temperature and pressure that are usually those of the atoms that constitutes us. We will attempt to describe this pre-atomic universe, and to guess how it might have functioned to have generated, through its inevitable evolution, the universe of atoms and radiation.