dvd national geographic digital media.level: graded readers.the arctic region of canada is home to a huge depression in the earth called the haughton crater. a group of explorers has come to the area to explore the challenges expected when traveling to mars. what challenges will they experience? what preparations are being made for a trip to mars here on earth?.rob waringdr. rob waring is an associate professor at notre dame seishin womens university in okayama, japan. his research interests extend to reading and the acquisition of vocabulary. he is a founding member of the extensive reading foundation and a well-known expert on extensive reading. he has published many articles on extensive reading and is program advisor to many educational institutions throughout asia. he maintains an extensive reading website, and is owner and moderator of the extensive reading discussion list. he was co-conference chair of jalt 2005 in shizuoka, japan.