After two and a half years as National Public Radio's Moscow bureau chief, David Greene travels across the country -- a 6,000-mile journey by rail, from Moscow to the Pacific port of Vladivostok -- to speak with ordinary Russians about how their lives have changed in the post-Soviet years. Reaching beyond the headline-grabbing protests in Moscow, Greene speaks with a group of singing babushkas from Buranovo, a teenager hawking 'space rocks' from last spring's meteor shower in Chelyabinsk, and activists battling for environmental regulation in the pollution-choked town of Baikalsk