For those readers concerned with Internet privacy, Tails will be a welcome innovation. The free, open-source, live operating system can be used from almost any computer. It runs through Tor, an anonymity network of over 6,000 users from around the world, so that readers can surf the web anonymously without sites picking up their IP addresses or other revealing information. The service makes sure sites leave no trace on your computer, and can also be used to encrypt files, emails, and instant messaging. Downloading the program is as easy as clicking a button.