"Now there is an answer, thanks to a big, new experiment from economists at West Point, who randomly banned computers from some sections of a popular economics course this past year at the military academy. One-third of the sections could use laptops or tablets to take notes during lecture; one-third could use tablets, but only to look at class materials; and one-third were prohibited from using any technology.
"Unsurprisingly, the students who were allowed to use laptops — and 80 percent of them did — scored worse on the final exam. What’s interesting is that the smartest students seemed to be harmed the most."
Multi-tasking doesn't work.