From riding a zip wire over the Rio Negro in Colombia to clinging to the remains of a collapsed rope bridge in Indonesia, students have to be wide awake to navigate these precarious routes.And if you moan about having to cram on to a packed train or bus each day, how about sharing a tiny horse cart with thirty five people, clinging to tyre tube while drifting down a river, or riding a donkey for five hours up a narrow mountain pass?These startling images will make that stuffy, over-crowded train carriage look like a walk in the park...(dailymail.co.uk)Bakudaily.Az