David Morrison is a long-time NASA senior scientist and Committee for Skeptical Inquiry fellow. He now divides his time between the SETI Institute and the NASA Lunar Science Institute. He hosts the "Ask an Astrobiologist" column at NASA's website.
Evolution opponents are framing the issues to our disadvantage.
Media reporting on asteroid impact-related science frequently exaggerate the uniqueness and significance of new research.
A scientific consensus agrees that cosmic impacts have played a major role in Earth history...