‘Passive Houses’; Hunger In Cold Weather; Twitter And Hate Speech; Astrophysicist Wins Award

On The 21st: 'Passive houses' are insulated eco-friendly homes which need almost no heat or airconditioning -- and in the U.S., they started in Urbana. We also speak with the executive director of the Rock River Valley Pantry about how the freezing weather affects people who need their services. Plus, we hear about how Twitter is handling hate speech, and talk to a Northwestern astrophysicist about black holes and how she first got started in astrophysics.