Philosophy (from Greek φιλοσοφία, philosophia, literally “love of wisdom”[1][2][3][4]) is the study of general and fundamental problems concerning matters such as existence, knowledge, values, reason, mind, and language.[5][6] The term was probably coined by Pythagoras (c. 570 – c. 495 BC). Philosophical methods include questioning, critical discussion, rational argument and systematic presentation.[7][8] Classic philosophical questions include: Is it possible to know anything and to prove it?[9][10][11] What is most real? However, philosophers might also pose more practical and concrete questions such as: Is there a best way to live? Is it better to be just or unjust (if one can get away with it)?[12] Do humans have free will?[13]