"If a man will begin with certainties, he shall end in doubts; but if will be content to begin with doubts, he shall end in certainties." - Bacon, Sir Francis

"[W]hen you have eliminated the impossible, whatever remains, however improbable, must be the truth." - Doyle, Sir Arthur Conan spoken by Sherlock Holmes

"Facts are the air of scientists. Without them you can never fly." - Pavlov, Ivan (1849-1936) [Russian physiologist]