Nas is helping to shed light on the worldwide impact of break dancing.  According to HollywoodReporter.com, the hip-hop star has signed on to executive produce the upcoming Adam Sjoberg-directed documentary “Shake the Dust.”  The film chronicles teenagers in South America, Africa and Asia, who express themselves and their love of hip-hop through break dancing.  Apart from production credits, Nas will also provide the original music for the film.  In a statement, Nas says that the teens featured in the film remind him why he fell in love with hip-hop.  After hearing Sjoberg’s vision for the film, Nas was “incredibly excited” to help bring the documentary to a global audience.