Are Smartphones Turning Us Into Bad Samaritans?

In late September, on a crowded commuter train in San Francisco, a man shot and killed 20-year-old student Justin Valdez. As security footage shows, before the gunman fired, he waved around his .45 caliber pistol and at one point even pointed it across the aisle. Yet no one on the crowded train noticed because they were so focused on their smartphones and tablets.

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