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A bit old, but it came up in a nice post on Lawtech about how gadgets are driving us to distraction. Let's let the pullquote speak for itself:

Those distracted by incoming email, phone calls and text messages saw a 10-point fall in their IQ, more than twice that found in studies of the impact of smoking cannabis, according to the researchers.

Emails more damaging than cannabis [VNUNet via LawTechGuru]