Two stories imagined by Martin Mystère for the fantasy Zone X series; the theme of both stories is that the Universe is completely different from the account given by History and Science. In the first one, we discover that Aristotle was right: the Earth is flat, the atom is indivisible and it is the Sun that revolves round us, but the most incredible thing is that all of our most famous scientists have always known this. The second story, instead, reveals the true date of the creation of the world : the 31st of December 1899 !