Protons Have Mass? I Didn't Even Know They Were Catholic Creative Sketchbook - 110 Large Blank Pages 8.5" x 11" This cute & funny science joke says "protons have mass? I didn't even know they were Catholic " A hilarious science pun for anyone who loves proton jokes or teaching people about the funny wordplay in the science field Grab this fun proton pun for a science major in college or even a science teacher and they'll love you for it A...