Need a quick way to remind the students that time is running out? In the library, time seems to be our enemy!
To help remind the students, I set up a PPT with 17 slides. One explains how it works, and then once you forward it to the "15" slide, it will automatically advance every minute until a "explosion" sound goes off and the last slide tells that time is up and the students need to go back to their seats. It's easy to see from the entire room, and the sound is hard to ignore!