The Chemistry students got a primer (look it up) into the history of manned space flight and the practical difficulties in sending humans to other planets. The students have a lot of questions about this and I think this answered some of them. Hopefully that one kid now knows that no one has ever been to Mars.
The AP Biology students discussed the characteristics of all animals today. Cephalization is the concentration of sensory organs in the anterior end of an animal. Yup, that's true. Also, animals tend not to walk in their own poop.