What did you learn today? This site aggregates Tweets that use the hashtag #ylsned and Flickr photos that are tagged ylsned and that are published under CC-BY, CC-BY-ND, CC-BY-NC, or CC-BY-NC-ND licenses. All items credit the author/photographer and link back to the original. If, however, you would like your item removed, please contact me via the "Submit" page (link below). Tweets that contain the @ symbol are not aggregated.