I love thinking about Incas. I really do think this civilization could not have flourished if there was as much corruption as we have now. I believe our technology allows us to sustain a corruption load. Then there is an article on doing wildlife science in a war zone and the real cost of neglecting people near a food source. Finally there is a story of property gradients which finishes with a nice observation of how nature replenishes itself so doesn't have to hit the durability reliability limits we have in our technological society. MP4 recording     MP3 recording -- -- Your browser does not support the audio element.