The scores who return daily to wave faded photos of those long lost have sad tales to tell.

ECONOMIST: Postwar Iraq

On their return they triggered a new wave of film making whose output was fresh and impertinent, if at times naive.

ECONOMIST: The Kazakh film industry

Many of Baghdad's ranking police officers were on hand as Mohammed Mussen al Zubaydi urged them to help return security to the streets and halt a wave of looting.

CNN: Baghdad civil servants mull resuming work

Ms Le's boss at Indochina Capital, Tung Kim Nguyen, a Vietnamese-American, reckons there is a bigger wave to come as older exiles return to spend their final years back in their homeland.

ECONOMIST: Former refugees bring back skills and money

In New Orleans, summer vacation is over for a second wave of public-school children who return to class today.

NPR: New Orleans Schools Welcome Back Students

The two parts are arranged so that when they return to the beam-splitter, the peaks of one wave are in step with the troughs of the other.

ECONOMIST: Fundamental physics