 and he split them into two groups the first group was told get on with your task whatever it is you're not going to be interrupted by things like slack the second group was told um get on with your task whatever it is but at the same time you've got to answer a heavy load of email and phone calls the group that was interrupted did scored 10 iq points worse than the people who weren't which is incredible that's twice the effect of smoking cannabis right so it's really bad for them about for you but you can make that case to your boss but the truth is