"It's a wonderful contribution and another piece of the mosaic" supporting the out-of-Africa hypothesis, said Ekkehard Wolff, professor emeritus of African Languages and Linguistics at the University of Leipzig in Germany, who read the paper.

WSJ: Study Points to a Single, Original Language for All Humans

"Schemes using employment guarantees and an emphasis on training could help get jobseekers off the street and into useful activities, providing a safeguard against further economic stress, " lead author of the report Ekkehard Ernst said.

BBC: Youth unemployment 'set to rise'