The Chemistry students completed the Uranium-238 decay series which, of course, ends at Lead-206. Don't know what we're talking about? Look it up, man. You're online right now. Google "uranium-238 decay series". Better yet, open a book for once.
The AP Biology students did a cladogram problem from last year's AP Biology Exam. I think it was pretty easy for most of the students. We're gonna have a quiz tomorrow.