Project GUTS — Growing Up Thinking Scientifically — is an integrated science and computer science program for middle school students serving schools and districts internationally. Growing up thinking scientifically means learning to look at the world and to ask questions, developing and using computer models that help answer questions through scientific inquiry, and using critical thinking to assess which ideas are reasonable and which are not. To grow up thinking scientifically means knowing science to be a computing-rich, dynamic, creative endeavor, a way of thinking, rather than a body of facts.