13. Photo of Wikipedia : http://www.flickr.com/photos/kk/384123150/sizes/o/in/photostream/Photo of Wal-Mart :http://www.flickr.com/photos/loneprimate/89840869/sizes/o/in/photostream/Photo of Netscape : http://www.flickr.com/photos/nedward/167699163/sizes/o/in/photostream/Photo of Google : http://www.flickr.com/photos/yodelanecdotal/1449868160/sizes/l/in/photostream/Photo of Website of Google : http://www.flickr.com/photos/mathowie/7931864/Photo of Yahoo : http://www.flickr.com/photos/jeremiah_owyang/3743073130/sizes/o/in/photostream/Photo of wireless internet : http://www.flickr.com/photos/avlxyz/459526249/sizes/o/in/photostream/