Of course, the person who looks the least concerned is the President himself. Notice how he's slumped in his chair, knee up and resting on the table. Not very concern-like, at all.

In fact, Barack Obama has been criticized in the past for a deficit of concern, especially when he's supposedly doing things that are very, very serious.

The President took a lot of feet ... we mean, heat, for this photo of him talking on the phone with Israeli Prime Minister Benjamin Netanyahu back in 2009. Many Israelis and some American conservatives accused Obama of being disrespectful to the man on the other end of the line, suggesting this feet-on-desk posture proved he wasn't sufficiently concerned about Netanyahu's country. (And it's not nice to show people your feet, either.)

The President can still get away with that though, because he's the President. But if you find yourself in a meeting with him, don't even think about slouching, let alone taking your feet off the floor. Even Cabinet-level officials know that you have got to show your concern. Here's John Kerry (as a Senator) returning the favor.

Senator Harry Reid is concerned. Rep. Steny Hoyer, not as much. Hoyer was the House Majority Leader. Reid remains the Senate Majority Leader.

There's some concerned people in this photo...

... but come on, Chuck Schumer!

It's Concern, not McKayla Maroney!

That's a little better. Needs work. But you can't beat Joe Biden, who is the Master of Concern.

See? The guy is a pro. You don't get to be Vice President by not being concerned. (Good effort by the man across the table below though.)

Just remember that when meeting in the Situation Room, you can never be concerned enough.

Don't get us wrong. The President can show concern. In fact, he's great at it. Look:

It's just that no one has to make him show concern. If he wants to put his leg up in the air and slide back in chair while talking about matters of national security, then he's just going to do that. Rahm Emmanuel had enough concern for both of them.

The relaxed posture doesn't mean Obama's not concerned. In fact, when he leans back, he might be the most concerned guy in the room:

"Am I concerned enough about this?"

"Yes, I should definitely think about being concerned about this."

The point is that you can tell a lot about who is showing the proper concern and who isn't, just by watching their hands and face—or in Obama's case, his knee. And if someone isn't showing concern, they simply aren't doing their job. Take a look.

Eric Holder is concerned, and Hillary Clinton has some good concern in her too, but the President's high knee suggests he's the least concerned of all.

The President has never been concerned about Hillary not being concerned enough. The Secretary of State is a champion of concern. Here's her crowning achievement:

No one has ever been more concerned. Ever.