CNN Student News CNN Student News - November 21, 2013 zetty 2013. 11. 21. 20:54 This Thursday, we cover negotiations surrounding Iran's nuclear program, a MAVEN's mission to Mars, and the effectiveness of helmet impact sensors. 오디오로 듣기 동영상으로 보기 스크립트 보기 다운로드 저작자표시 비영리