Wikipedia: The settler of dinnertime disputes and the savior of those who cheat on trivia night. Quick, what country has the Nile’s headwaters? What year did Gershwin write “Rhapsody in Blue”?

Depending on what day you search, Wikipedia may say global warming is "a sham" or that there is "a consensus view that it is man-made." That kind of flux isn't unusual: Wikipedia pages on hot-button ...