Cartesian doubt is the basis for Descartes' statement, ""Cogito ergo sum"" ("I think, therefore I am"). Methodological skepticism is distinguished from philosophical skepticism in that methodological skepticism is an approach that subjects all knowledge claims to scrutiny with the goal of sorting out true from false claims, whereas philosophical skepticism is an approach that questions the possibility of certain knowledge. Cartesian doubt is methodological. Its purpose is to use doubt as a route to certain knowledge by finding those things which could not be doubted. The fallibility of sense data in particular is a subject of Cartesian doubt. There are several interpretations
Fuzzy Ergo Sum he is a fan of Piper, and he’s also a good enough writer to pull off the right mix of homage and originality." However, several reviewers objected to the lack of any warning on the cover that this book ends on a cliffhanger, making the story incomplete. Fuzzy Ergo Sum Fuzzy Ergo Sum is a science fiction novel written during 2006-2009 by Wolfgang Diehr as a sequel to H. Beam Piper's Fuzzy trilogy: "Little Fuzzy", "Fuzzy Sapiens", and "Fuzzies and Other People". The trilogy concerns the discovery of a primitive species of small, childlike but sapient furry creatures on Zarathustra,