/ http://www.slideshare.net/images/logo.gif / 狠狠撸Share feed for 狠狠撸shows by User: thomasleranth https://cdn.slidesharecdn.com/profile-photo-thomasleranth-48x48.jpg?cb=1523232649 There are three signs of senility. The first sign is that a man forgets his theorems. The second sign is that he forgets to zip up. The third sign is that he forgets to zip down.-- Paul Erdos|||