/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: JosephGgZ https://cdn.slidesharecdn.com/profile-photo-JosephGgZ-48x48.jpg?cb=1523598801 Saber que se sabe lo que se sabe y que no se sabe lo que no se sabe; he aqu鱈 el verdadero saber.