Tamra Rossiter, Riverton High School, Riverton Utah Try before you buy I spend more time teaching instead of showing the PowerPoint, then raising screen to do chemistry math problems, then lowering the screen to show PowerPoint.
Tamra Rossiter, Riverton High School, Riverton Utah Try before you buy I spend more time teaching instead of showing the PowerPoint, then raising screen to do chemistry math problems, then lowering the screen to show PowerPoint.