You can’t read a few syllables into many scientific papers without running into an acronym, but in the Plasma Laboratory at the Department of Geology at the University of Maryland in College Park, you can’t even get through the door without encountering one, in this case a familiar one that the lab has repurposed. I was there for a reporting trip earlier this week. I found plenty of evidence of isotopes inside, but not of pain, which of course could have been hidden to my eye. Inside the lab you find, among other things, a couple of inductively-coupled plasma mass spectrometers that are handy for such jobs as determining the elemental and isotopic compositions of meteorites. You are invited to forward your own pictures of lab door humor, or attempts at such humor, to me (email@example.com).