Welcome back to CLT! My students have their first exam of the semester this week. MS, IR, and NMR spectroscopy. Wish them luck I have no idea what the origin of this cartoon is. It was on the office door of one of the professors at UNC where I did my Ph.D. I asked him to scan it for me when I left so I could pass it on to my students. They don’t like it very much Click the image for larger. See other CLT humor via ??? Enjoy!