A theory that understood this concept using causal chains was later challenged with “fake barn” cases introduced (-5[1])by the reliabilist thinker Alvin Goldman. Four conditions need to be met in the truth-tracking theory of this concept proposed by Robert Nozick. A three-page 1963 paper challenges a definition of this concept with a case where Smith thinks Jones will get a job and also has (-5[1])ten coins in his pocket. That case, developed by Edmund Gettier, (10[1])challenges Plato’s definition of this concept in the (10[1])Theaetetus as “justified true belief.” (10[1])This concept is studied in epistemology. (10[1])For 10 points, (10[1])skeptics doubt the existence of what concept (10[1])that Francis Bacon claimed “is power”? (10[1])■END■ (10[1])