Teaching techniques nowadays are far better than the primitive era. Even students prefer these techniques because it is easy for them to understand the lectures and convenient to the professors too. Lectures are given through email or opening a website. The only problem is the lack of internet or the device.
This Wiimote can detect the Infrared light from an IR pen powered by a battery. You can write the pen on an LCD or in any surface just like tracing a drawing then what you have written will reflect on the LCD.
This is perfect for teaching because it can use different colors and lets you erase your errors.