 There is a practical reason for Google to make this change, says Chirag Shah, a professor of information science at the University of Washington. Most users never get past the first results, but he says the reversal fits with a bigger shift underway at the search giant. It's all about the way you influence user behavior. When you provide all the links, he says, it's an invitation to click away all over the internet, shrink that list down, and you narrow users' focus.