Wikipedia's bias is more prevalent on specific pages, or collections of topics. Many pages have zero or near zero bias. You're not going to have much bias on scientific topics like, say resonant structures.<p>It's a lot more prone to bias on biographical topics, where senior editors can essentially suppress any negative coverage, or promote embellished facts about a person. Take a gander at the talk page of controversial articles, or more specifically the history of the talk page since talk pages themselves get pruned and censored.