The Chemistry students saw what happens if you screw up the Explosion Lab on a planet other than Earth. It isn't good. Maybe they learned we also exhale oxygen. Did you know that? It isn't just carbon dioxide. We exhale oxygen and nitrogen, too. If we didn't, CPR wouldn't work and, in fact, it would kill people faster. Think about it.
The AP Biology students did some of the grid-in math questions from an old AP Biology Exam today. I have to admit, I did pretty good on them and I'm no math or biology genius. In some ways, this exam is just one big logic test. Kinda. Well, it's good to know some biology before you take it.