This document discusses how people overuse email and the negative impacts of chronic email interruptions. Some key points: - People on average check their email 74 times per day and interact with email via smartphone for 13.5 hours per day. - Chronic email interruptions can lower functional IQ by 4 points and reduce productivity by 40%. - The document provides tips for using email more effectively such as only sending emails that are needed, using clear subject lines and structured email bodies, and coaching coworkers on sending fewer but more actionable emails.