Ancient faces brought to life

I'm intrigued when scientists/artists are able to recreate the faces of the past:

"It has always been Nguyen Van Viet’s dream to recreate the faces, and lives, of ancient people. After years of study abroad and hard work, Viet and his colleagues finally have a place in the sun with the recent Dong Xa excavation, which revealed a tomb with 20 2,000-year-old skeletons from three different races."