  When you investigate whether P, there are three possibilities: (i) you discover something (you find that the reasons for believing one of P and not-P outweigh any reasons for believing the other), or (ii) you deny that it is possible to discover whether P, or (iii) you find that so far, the reasons for believing that P and the reasons for believing that not-P balance each other out, and so you keep on investigating (PH I 1). So-called ‘Dogmatic’ philosophers think they make discoveries when they investigate; ‘Academic’ skeptics assert that no discovery can be made; Pyrrhonists carry on investigating and searching for the truth (I 3). (For the sincerity of this last claim, see Palmer 2000 and Perin 2006.) This, continues Sextus, is why Skeptics get their name (I 7): ‘to investigate’ in Greek is skeptesthai, and so skeptikos means something like ‘one who is disposed to investigate’, ‘investigator’.