Bystanders grieve the Boston Marathon Bombing.

Brian Williams discusses his career at the Murrow Forum, 2012.

Runners during the Boston Marathon, 2013.

Muslims trek to the Dome of the Walk in early morning to pray, 2012

HONK! Festival of Activist Street Bands, 2011.

Mp3 Flash Mob, 2012.

Immokalee workers protest unjust labor conditions.

Boston Walk for Choice, 2011.

Lady Gaga speaks at SLDN Rally, 2011.

Victims search for family after Boston MarathonMarathon bombing.

Boston Walk for Choice, 2011.

Homeowners observe the flooding after Hurricane Sandy in Somerville, MA.

Stefan Penington speaks at National Coming Out Day.

A woman shops in the Muslim quarter in West Jerusalem.

EMTs respond to Boston Marathon bombing.

Members at a Budget for All Rally, 2012.

Vigil Attendees mourn the suicide of LGBT teenagers, 2010.

Katie Couric answers questions at Murrow Forum, 2010.

Tufts Marathon Team Coach congratulates one of his runners, 2013.

Las Madres del Plaza del Maya protest in Buenos Aires, 2012.

Players celebrate after winning the NCAA Championships.

A woman celebrates during the 2012 Presidential Election.

A divestment rally marches in Medford, MA.

Crews clean up after Hurricane Sandy.

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