The chemistry students watched and participated in a demonstration with radioactive materials and the effects of certain types of shielding between the radioactive source and the detector. For example, we placed a beta emitter (Strontium-90) approximately 1.0 centimeters from the detector. We then recorded the CPM (counts per minute). We then placed different shielding materials between the source and the detector and measured the resulting CPM. We also measured the effect on distance between the source and the detector. Fun day.
The AP students reviewed the Hardy-Weinberg equation and associated problems. We have a quiz tomorrow! We also discussed extinction of a species and how it can impact many other species and, perhaps, lead to a mass extinction. Will humans cause the next mass extinction? Maybe. Or it could be the Seahawks in the Super Bowl. I know I feel like being extinct when I think about that.