Universe
I read a book, about what a mathematician who abandoned exact sciences for art thinks about the main problems the world confronts, there was a statement about the fact that at the beginnings in mathematics was only one type of Infinite, nowadays a lot of them are discovered, as an association he was thinking... maybe this is only one universe we discovered, it is possible to exist a lot of them. I have the same opinion, that we are very, very small, and the Universe is only an atom from the entire body we are part of.
This book has a lot of interesting statements.
There are different kind of books, the ones you read and everything is interesting while reading but after you read it, forget everything was written there, and there are the ones you read and at first you do not understand the idea but after thinking of it, a lot of other ideas come after it, I like more the second type.