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...But where is Malia?

Sasha Obama has had her parents to herself this summer -- and the absence of her older sister has sparked a recurring question on cyberspace: Where's Malia?

The answer is summer camp -- a rite of passage experienced by generations of US kids.

And as many parents can tell you, it's a rite of passage for the parents as much as the camper. "I may shed a tear," the president said in a recent interview.

In most camps, there are strict rules governing communication with home, to help the child adjust.