In December we shared with you a group of books filled with great reference facts and an enjoyable refresher course for upper elementary students - adults! While perusing through the Top 100 downloads on my Kindle today I was excited to see that a 4th book in the set from Reader's Digest, I Used to Know That: Stuff You Forgot from School, is available as a free download!
It will be offered from now until January 9. If you are a Kindle reader (it is also available for the Nook from Barnes and Noble) you will want to grab this while it is free. Enjoy!