what we have seen

here they are some videos of what we have see during the unit

http://www.youtube.com/watch?v=ijLc52LmFQg

http://www.youtube.com/watch?v=LLKX_4DHE3I&feature=relmfu

http://www.youtube.com/watch?v=teV62zrm2P0

http://www.youtube.com/watch?v=A2gilSwvQik

http://www.youtube.com/watch?v=Gdv01C74Mq0&feature=related