How to Search the Invisible Web

"The Web has become a big part of most students’ research processes; in fact, more people look on the Web for answers before checking any other reference. However, merely “Googling” something when it’s an obscure topic or if you need targeted information with a particular focus doesn’t always turn up the best results. That’s where the Invisible, or Deep Web, comes in. " From by Wendy Boswell's excellent article on LifeHacker.com