I'm currently reading "Three roads to Quantum Gravity" by Lee Smolin. In the book he describes attending a presentation by Fay Dowker and James Hartle about the consistent histories approach to quantum cosmology. He describes that, "there were worlds that were classical now that were arbitrarily mixed up superpositions of classical at any point in the past", and that they concluded that, "if the consistent-histories interpretation is correct, we have no right to deduce from the existence of fossils right now that dinosaurs roamed the planet a hundred million years ago". This really confused me. I don't understand the how the quote about dinosaurs relates to the topic in the way he describes it. Why do we have no right to deduce that from fossils because of this theory? I am by no means a very intelligent person. I recently started trying to teach myself more. I was just wondering if someone could explain this to me in a relatively simple way. Thanks.