Social knowledge related. Information related. Semantic related. Wikipedia related. Mind mapping related. Science related. Knowledge & deep Search engine. TED. TED: Ideas worth spreading. TED. Knowledge. Wisdom. Wikipedia. Knowledge Base. Science. Science category. Knowledge. Knowledge acquisition involves complex cognitive processes: perception, communication, and reasoning; while knowledge is also said to be related to the capacity of acknowledgment in human beings.[2] Theories of knowledge[edit] In contrast to this approach, Wittgenstein observed, following Moore's paradox, that one can say "He believes it, but it isn't so," but not "He knows it, but it isn't so.
" [5] He goes on to argue that these do not correspond to distinct mental states, but rather to distinct ways of talking about conviction. What is different here is not the mental state of the speaker, but the activity in which they are engaged.