Based on recent reports by the Guardian and intelligence leaks by former CIA employee Edward Snowden, it’s clear that the federal government can track online activity pretty easily. But there’s also a mysterious far-off corner of the internet, one that’s much harder to track. It’s a place where people go to buy illegal drugs and even dangerous weapons. And they pay for all of it in electronic currency. Andy Greenberg, Forbes Magazine writer, tells David Hyde about this online black market, also known as the Silk Road. Greenberg is author of the book "This Machine Kills Secrets," a chronicle of the history and future of information leaks, from the Pentagon papers to Wikileaks and beyond.