et finalement la comparaison avec une roche
http://www.google.ca/imgres?imgurl=http://complaintes-booleennes.rwatuny.net/contenu/2010/01/ipad-vs-rock.jpg&imgrefurl=http://complaintes-booleennes.rwatuny.net/index.php/category/humour/&usg=__Yb0Aaa5dSGnt-hb9eeWOodJOR2Y=&h=496&w=630&sz=50&hl=fr&start=64&zoom=1&tbnid=JKIgGENgvHD6qM:&tbnh=150&tbnw=191&prev=/images%3Fq%3Dipad%2Bhumour%26um%3D1%26hl%3Dfr%26sa%3DN%26biw%3D1600%26bih%3D797%26tbs%3Disch:10,1300&um=1&itbs=1&iact=hc&vpx=631&vpy=187&dur=396&hovh=165&hovw=210&tx=165&ty=97&ei=IKJ4TMPyKsKAlAfSuunsCw&oei=pKF4TNzeOMGC8gb7k6TzBQ&esq=3&page=3&ndsp=33&ved=1t:429,r:3,s:64&biw=1600&bih=797