"When you're on a three-and-a-half month voyage around the world, you ought to be able to sit and consider the sea." Will Post, a celebrated and sometimes controversial columnist, is a professor on the MV Explorer's Semester at Sea program, sailing around the world teaching the ups and downs of travel writing, while navigating the discomfort of three months at sea, as well as the uncomfortable truths that many of their stops bring up--poverty,...