The equation of the Universe

In this event I will share everything that I have learnt about the Universe in my career as an astrophysicist. In particular, the challenge is to present the equation which describes the expansion of the universe, in a way that also a child can understand. I will explain how little we know about the Universe  and how any simple question is legitimate and can actually put in trouble the most expert astrophysicist in the world.  There will be space for dialogue and the immensity of the Universe will make us feel what we actually are: global citizens of this small stone floating in the middle of nothing: the Earth.