IQ is variable...

These days, it's the social norm to be always on - in fact, when my sister can't get hold of me on my cellphone, she calls my land line, and the massage is always just "call me when you get this" - not "the sky is falling" or anything urgent, and she gets annoyed that I'm not always available, but sometimes I'm working, and when I work, everything goes OFF, otherwise the quality of my work suffers.
Yup they've done experiments, and according to a study by the University of London, when you are surrounded by distractions, apparently IQ drops by an average of 10 points.

And this bit always cracks me up - It's an average of 10 points because it's 5 points for women, and 10 points for men.