The Microsoft Research group in NYC invited me to give a talk on "To Explain or To Predict? How Prediction Can Advance Research". I spent half a day on Nov 3, 2015 at their beautiful lab and learned what "computational social scientists" study. The audience in my talk included folks with a computer science background from the computational social science and machine learning groups and others. The lively discussion touched on what the scientific method means and requires in social science research.