Editor’s Note: Sign up for Unlocking the World, CNN Travel’s weekly newsletter. Get the latest news in aviation, food and drink, where to stay and other travel developments. CNN  —  Don’t suck the poison from a cobra bite, avoid magic mushrooms while hiking and never try to outrun a hippo: CNN Travel is back once again with our weekly roundup of news and tips. When a Zimbabwean tour guide found himself head-first down a hippo’s throat, his body engulfed right to the waist, it was an all-time bad day at the office. Incredibly he survived, and here’s his advice for handling hippopotamuses. Hippos are found naturally in various parts of…