Not linear thinking theory
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Whenever we abandon an activity to do another we waste personal energy, and we disconnect ourselves from the source.
Common sense also tells us that we waste time and the connection-disconnection in all its forms (colleagues who interrupt us, wild multi-tasking or whatever ruin your time management) makes us unhappy. That our brain is not made for extreme multi-tasking they say extensive research in neuroscience that are studying the growing phenomenon as a result of email, messages, notifications, Facebook, Twitter and any other social network.
The connection-disconnection is inevitable in this historical moment, unless you decide to retire out of the world and lead a more bucolic life, but good personal and professional habits can help us find that balance that can increase our happiness.

Be farly happy.