Listen Live Workers install cryptocurrency mining computers inside a converted shipping container at the Compute North facility in Nebraska.NPR In the farmland on the outskirts of Kearney, Nebraska, there's a field full of modified 40-foot shipping containers lined up in rows. It's off the main road and easy to miss; there are no signs and no big buildings. But as you approach, you notice one thing: it makes a lot of noise. Each container is lined with huge industrial fans, and filled with specialized computers. Inside, it's windy, and humming at about 85 decibels. "Our technicians always have some sort…