One of the perceived limitations of PDAs by teachers is its small screen. However, some recent innovations have opened a variety of new opportunities for middle school science instruction. Now, with some relatively inexpensive equipment and software, science teachers can give students an opportunity to view PDA applications by projecting whatever is on the PDA’s liquid-crystal display (LCD) to a larger viewing screen. Using the same equipment, you can also connect your PDA to a computer to transfer the LCD image to a larger monitor.This month's column describes some PDA presentation packages that help make classroom instruction more visual.