Walk into any college classroom, and you're sure to witness a sea of glowing laptop screens and clicking keyboards. Teachers often worry about the distraction that laptops can create in a class, but what about students who stay honest and use them only to take notes? According to research, that's hardly any better. Studies show that writing notes by hand is far more effective than typing on a computer, and that applies to all levels of education, from grade school to grad school. The reasons might be surprising.