Certain types of fish and turtles serve as indicators of changing seasons or exceptional events.

UNESCO: Social and Human Sciences

That does not mean merely long enough to avoid exceptional events such as last week's.

ECONOMIST: All fall down | The

So what happened was both consistent, unfortunately, with a series of events that have been happening in the United States, but also exceptional in its horrendousness.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,