It's not that there was a blurry line before.

Science simply doesn't know yet; what constitutes that blurry line remains a mystery.

The subject has the advantage of avoiding a common problem in social science: the blurry line between correlation and causation.

The effort by business to focus its message is made tougher by the blurry ideological lines of today's politics.

The book deals with the supposed blurry line between consumerism and fascism.

Another challenge was the blurry line between myth and reality.

There's no longer any blurry line between show business and politics.

The book is revelatory about the blurry line between the good and bad guys.

The line, already blurry, is likely over time to disappear entirely.