This week we're looking back at a man-made disaster that changed the world: the Chernobyl meltdown. We take a closer look at all the contributing factors that lead the No 4 reactor at Chernobyl to explode and how the Soviet Union's political, scientific, and administrative culture at the time contributed to the disaster. And we'll look at the fallout, the logistics of trying to clean up a radioactive accident where five minutes in the wrong area will literally kill you, and the long-tail disaster recovery efforts. We are joined by Adam Higginbotham, author of the new best selling book "Midnight...