Armes, gèrmens i acer (Jared Diamond)




http://www.youtube.com/watch?v=dT8siQeQ8EU&feature=relmfu
http://www.youtube.com/watch?v=flE8X1i3DmI&feature=relmfu
http://www.youtube.com/watch?v=H8Wf-jK1WnI&feature=relmfu
http://www.youtube.com/watch?v=lyBtqTkZXlQ&feature=relmfu


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