Sorry I wasn't being clear. I meant reading PDFs already created by someone else with a certain paper size in mind, like a scientific paper. Basically, I am looking for something like a "reader view" mode for PDFs on smartphones.
They explained their methodology on forecasting these populations by factors such as birth rates, migration, and mortality rates. Where did you read the part that mentioned wars?
Ernest Davis is a professor of computer science at New York University. He has authored four books, including Representations of Commonsense Knowledge.