Description
"'Facts, facts, facts,' cries the scientist if he wants to emphasize the necessity of a firm foundation for science. What is a fact? A fact is a thought that is true. But the scientist will surely not recognize something which depends on men's varying states of mind to be the firm foundation of science." —Gottlob Frege (1956)
"However beautiful the strategy, you should occasionally look at the results." —Winston Churchill
"A hallucination is a fact, not an error; what is erroneous is a judgement based upon it." —Bertrand Russell [On the Nature of Acquaintance: Neutral Monism (1914)]
"I mean, you could claim that anything's real if the only basis for believing in it is that nobody's proved it…
Full description on the Flickr photo page.