Here’s a frightening list: every month there has been a shooting of multiple people in the U.S. Of course not all are “mass shootings,” but many include the words “open fired” and were at places—like nightclubs, restaurants, NBA games, parties—with crowds: http://www.bradycampaign.org/xshare/pdf/major-shootings.pdf.
The Many Impacts of Autonomous Vehicles
New research points to the potential effect of self-driving cars on things like city space and public transit.