In late April I took a trip to Wisconsin where I worked on a couple of radio pieces. One of them was for a chemistry program called Distillations. For them, I produced a story about the researchers and science behind “porthole” cows, that is, cows that have had a window inserted into their sides so that scientists can observe their digestion. What amazed me is that this research actually appeals to the Department of Energy because of its potential implications for biofuels. Here’s the story. Enjoy.