It’s easy to assume that huge amounts of available information automatically provide knowledge. Some students might at first be excited about receiving 20,800,000 hits from a Google search on political ethics, but shock takes hold when they realize that their discovery is utterly unsorted. They might respond by using only the first several hits, irrespective of quality. A more productive approach is to think critically about the usefulness of potential sources by measuring them against three important criteria: relevance, authority, and bias.