I think science fiction is not only fantasy plus science, I think, this type of books is an open door to the future, is the type of books that open your mind to

I think science fiction is not only fantasy plus science, I think, this type of books is an open door to the future, is the type of books that open your mind to think about the future. Also, when you read old science fiction books, you realize you are in the future, this is the future.