It is almost as bad to proctor a final exam as it is to take one. Almost. Words my students wanted me to help them define: "defoliate" -- when all the leaves fall off "hallucinate" -- it's something that happens in your mind. Oh, like when you're in the desert and you see things? Yes! Exactly like that. "prevalence" -- the frequency with which something occurs (like Lyme Disease infections) "sympatric and allopatric speciation" -- sorry, can't tell you! "gestation" -- Really?! But no, can't tell you.