Announcement: clarification on reactions

Hey folks, 

Understandably, there is confusion about what to react to when. My apologies. 

Basic rule: look at the calendar, and react to the topic listed for that day. If you see a posted short for the topic, react to that before class. If you don't, you can either react to notes, or wait until class and react to lecture. 

Today: more ray tracing. React to lecture. 

Future: to help I'll post reminders before class whether or not there is a short. 

Professor Watson