Restricting speech inevitably prevents ascertainment and publication of true facts and accurate judgments it entails an unwarranted assumption of infallibility on the part of the government.

To someone unfamiliar with the director, unwilling to make unwarranted assumptions as to her desires, beliefs, goals, or values, the director's 'signature' will not be evident.

Can the record provide an unambiguous date without making unwarranted assumptions about ancient astronomical observational methods?