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UCLA researchers Oppenheimer and Mueller wondered if there was something about paper and the act of writing that explained this phenomenon, so they conducted an experiment. They asked about 50 students to attend a lecture. Half took notes on laptops and half with pen and paper. Both groups were then given a comprehension test. It wasn't even close. The students who used paper scored significantly higher than those who used laptops. Mueller attributes this unexpected finding - published in the journal, Psychological Science - to the fact that the "analog" note takers were forced to synthesize rather than merely transcribe. It's a phenomenon known as "desirable difficulty." "Desirable difficulty is some small roadblock that is in your path that actually improves your understanding of a topic," she explains.