"Now I Know": Test your knowledge. Take the quiz...
//news.yahoo.com/who-knew/longest-books-britannica-s-print-edition-retir...
Uploaded for educational purpose, to be used at //whoknewth.com, with no intention to infringe on any existing copyrights. All content and the Yahoo! trademark are the property of Yahoo! Inc.
Don't forget to check out //whoknew.news.yahoo.com for the latest video!