7
Pictures:
http://i1.ytimg.com/vi/oumlYbwfAsI/maxresdefault.jpg
https://pbs.twimg.com/profile_images/633946199/BStone_B.jpg
http://workprog.files.wordpress.com/2012/10/robots-auto1.jpg
http://images.fastcompany.com/upload/robo_600-112.jpg
http://cdn.medgadget.com/img/xmmnstl8.png