For those interested in images, especially the evolution of visual themes over time, you might find of interest my latest collaboration with the Internet Archive and Flickr to extract the images of the Archive's 600 million pages of digitized books dating back 500 years from over 1,000 of the world's libraries, 2.7M of which are now available on Flickr (the rest will be uploaded over the coming months to ensure a constant dynamically updated stream), browseable and searchable by the book metadata and the text surrounding each image on the page. There's a breathtaking range of topics, events, locations covered in the collection, but one humorous theme that the BBC article notes is that even 100 years ago people were dressing up their cats and publishing pictures of them ( https://www.flickr.com/photos/internetarchivebookimages/tags/bookidkittensca... ). http://www.bbc.com/news/technology-28976849 http://blog.archive.org/2014/08/29/millions-of-historic-images-posted-to-fli... http://blog.flickr.net/en/2014/08/29/welcome-the-internet-archive-to-the-com... ~Kalev Yahoo! Fellow Georgetown University http://kalevleetaru.com/