Kirk Langford, a Rotarian in the London Centennial club, talked about his expedience as an exchange student.  Kirk was an exchange student to Brazil in 2006 and it was a life changing experience.  The impact of the exchanges for Kirk is it allowed him to see things through a new lens and to be aware of the cultural filters we all have.  Simple things such as hand gestures have different significance in different cultures.  He made life long friends through the exchange.  He said exchanges help lead to peace because "you can't shoot your friends".