The three big rules of research, as they were taught to me in high school, are pay attention to source bias, never trust the Internet (especially Wikipedia), and remember that statistics can be misleading.

FORBES: Reading Charts

In addition, newspapers began to separate advertisements from the news, eliminating a source of bias (distortion).

CNN: Understanding The Role of the Media

Comparing winners and also-rans from within the same countries, to avoid yet another source of bias, Dr Rablen and Dr Oswald found that the winners lived, on average, two years longer than those who had merely been nominated.

ECONOMIST: Is two years extra life