The Soviet Union's nuclear program was once one of the largest in the world. But from Chernobyl to the empire's former atomic bomb site in Kazakhstan, the legacy of that effort still affects tens of thousands of people in the former Soviet republics of Kazakhstan, Belarus and Ukraine. On this edition of Global Journalist, we learn about the Semipalatinsk test site in the Central Asian nation of Kazakhstan, where more than 400 nuclear weapons were tested and where local people now graze their