The Shallows talks a lot about Google Books, and many of our books have addressed the issue of copyright. This is a really interesting article about "orphan books" and where they fall into this argument. (An orphan book is one that the copyright has not expired, but where they copyright holder is unknown or can't be found)
More evidence of the brain's plasticity. I mentioned in my presentation that certain medications can cause new brain cells to grow. Here's a related article.