part2: http://www.dailymotion.com/video/xo9c3i_2012-national-geographie-part2<br />part3: http://www.dailymotion.com/video/xo9cby_2012-national-geographie-part3<br />autre doc:<br />http://www.dailymotion.com/video/xan0tj_2012-new-doc-part1_news
