Betteridge’s Law of Headlines

Via Marcin Wichary’s blog, a TIL (today I learned):

Betteridge’s law of headlines is an adage that states: “Any headline that ends in a question mark can be answered by the word no.” It is based on the assumption that if the publishers were confident that the answer was yes, they would have presented it as an assertion; by presenting it as a question, they are not accountable for whether it is correct or not.

More at the Wikipedia page.