explorer, bringing his advent e adventurous spirit to cnn in 2013, where he shaved his curiosity to audiences around the world on parts unknown. you ll have to walk me through. reporter: former president obama who joined bourdain on parts unknown in vietnam tweeting he taught us about food, but more importantly, about its ability to bring us together. to make us a little less afraid of the unknown. people tend to be proud of their food. they let their guard down when they talk to you. you stheem you see them at their most vulnerable. so even people who you really have fundamental disagreements, maybe different belief systems, if you are going to intersect anywhere, it will be abover foo. bourdain s passion resonated with so many. including millions who never met him yet who greatly admired everything he introduced them to and the way opened their eyes