Discovery Channel has released four more apps for the Amazon Fire TV and Fire TV Stick. The network already released apps for their 5 most popular channels a couple of months ago, and now they’ve padded the collection with new apps for Discovery Life, Velocity, American Heroes Channel (AHC), and Destination America. As you’d expect, these new apps carry the same layout and structure as the previous Discovery apps. That means you’ll have to activate the apps with a TV subscription provider to view all of the available content, however, there is a small collection of completely free content available without a subscription, including full episodes of select shows. If you do activate the app, you’ll have access to a live stream in addition to the on demand content.