Dartmouth College computer science professor Sean Smith, 50, holds office hours at Umpleby’s Cafe in Hanover, N.H. before heading to the college for a meeting Wednesday, July 15, 2015. Smith is research director of the Institute for Security, Technology and Society. (Valley News – James M. Patterson)

Copyright © Valley News. May not be reprinted or used online without permission. Send requests to permission@vnews.com.