The chemistry students continued with the Radioactivity Lab today despite having another day when we were missing a lot of students (11). We measured the effects of having multiple layers of shielding between a radioactive source and a detector. It was no surprise to find out the multiple layers of lead did a good job blocking beta particles, but it was a surprise to see the gamma rays were virtually unaffected by multiple layers of lead. We'll finish this lab tomorrow.
The AP students finished watching a video on extinction and its effect on our own population. Are we going to be the cause of the next mass extinction? Perhaps. We certainly are impacting the Earth like no other species has before.