A classic argument for skepticism about the external world runs as follows. First: we cannot know that the evil-demon hypothesis is false, where the evil-demon hypothesis says that all of our sensory experiences have been produced by an evil demon. Second: if we cannot know that the evil-demon hypothesis is false, we cannot know we have hands. Conclusion: We cannot know we have hands. Generaliz...

In two previous essays (Perron, 2006 and Arsenault & Perron 2008), I have conceptualized the partaking in a game as a cognitive frame, as an ongoing process. To explain the gamer's immersion and progression through a game, I have resorted to the figure of the cycle, of the spiral instead of talking about Huizinga's " magic circle ". In this model, three interconnected spirals are represented: t...

BACKGROUND Ethiopia has high prevalences of udder health problems including clinical and subclinical mastitis across production systems in different livestock species. Previous studies on udder health problems have largely focused on identification of mastitis causing microbial pathogens and associated risk factors. However, relatively little is known about the knowledge and beliefs of livestoc...