Reviews are mixed, which is a dangerous sign.

FORBES: Mixed Reviews for the Surface Do Microsoft No Favors

That is a dangerous sign.

CENTERFORSECURITYPOLICY: Army of privates

In light of such controversy, critics posed the question: Is Kony 2012 a sign of how powerful social media can be as a news distribution mechanism, a sign of how dangerous it can be, or both?

FORBES: What Kony 2012 Can Teach Us About Ourselves

The Clinton administration wants desperately to believe that President Yeltsin does not know anything about this activity -- that it is the product of "rogue elements" and bureaucratic inertia, not a breakdown of civilian control or, worse yet, a sign of a dangerous new direction in Russian foreign policy.

CENTERFORSECURITYPOLICY: A Noxious Arms Control Treaty

Firefighters took down a "dangerous" kebab shop sign which had become dislodged by strong winds in Gravesend, Kent.

BBC: 100mph storm winds batter south

While there is nothing wrong and unusual for celebrated business leaders to talk up the past of the companies they lead, it could often be a sign of a dangerous trait of these leaders: Complacency.

FORBES: The Most Dangerous Trait of Celebrated Leaders

When it shows up in children, it's a sign of "accelerated aging, " Dr. Urbina said, and likely raises the risk of dangerous outcomes relatively early in adult life.

WSJ: Heart-Attack Risk Starts Younger