Welcome to Double X Science podcast recorded Feb 15, 2013. Co-hosts this week are Adrienne Roehrich, Chemistry Editor, and Matthew Francis, Physics Editor. Topics covered are posts of the week, with emphasis on "How big is a proton?" and "Notable Women in Science: Historical Biochemists" for Double X Science and "The Science of Procastination" for Double X Science Jr. We also cover one piece of news this week, the origin of cosmic rays. Blog posts mentioned can be found at www.doublexscience.org