Before anyone says so, I'll admit tallying the different activities subway riders are engaged in is a tad obsessive. But it's also instructive. To wit ...
On my most recent subway ride, including myself, thirty two people (yes, I counted), traversed from Penn Station - my starting point - to Lincoln Center where I got off. During the ride, I observed four folks eating, three sleeping, three more doing nothing easily discernible aside from staring. Two were conversing, one was tending to the only child, and one other person was reading a book. Your guess about the activity of the remaining seventeen?
Hint: In her must-read book from 2015, "Reclaiming Conversation", Sherry Turkle cites a statistic asserting the average American adult checks their cell phone every six and one half minutes. That works out to about ten peeks per hour, one hundred and sixty glances per day if you're awake for sixteen hours. How do you compare to that average?
Forgot to mention: The person who started the ride reading the book took a break jot down the tally.