Since the late 1970's, I have been creating short, self-contained expository articles on mathematics, placing them all immediately in the public domain, and sending a copy of everything to the National Science Foundation. In 2001, they sent me a kudos letter for this initiative of mine. Not long ago I opened an account on Scribd and began uploading these articles there. I am also uploading longer articles on mathematics, and articles on other topics. I have placed everything that I have uploaded to Scribd into the public domain. Attribution is not required. The latest thing that I have uploaded is 'topaz booklet of mathematics'. It is a scaffolded treatment of mathematical sequences. It is a pdf file, 25 pages in length. Previously, you had to be a member of Scribd to download a document of someone else's. However, recently, Scribd, acknowledging the need for a repository of materials that teachers can freely draw from, has given each member the option of allowing unfettered downloading. I have accepted that option, so you are at liberty to download whatever you wish to of my documents at no cost. In order to make it easy to find me on Scribd, I created a document with a code. If you google for that code, you will get that document, which contains my identification information. The code is 13076743680001024 (which is 15 factorial, concatenated with the 10th power of 2).