You don't even have to skew the results, you can impart bias just by choosing which stories to research. I've always liked the way Howard Zinn put it in the aft

You don't even have to skew the results, you can impart bias just by choosing which stories to research. I've always liked the way Howard Zinn put it in the afterword to A People's History of the United States: >But there is no such thing as a pure fact, innocent of interpretation. Behind every fact presented to the world—by a teacher, a writer, anyone—is a judgment. The judgment that has been made is that this fact is important, and that other facts, omitted, are not important.