Workers at the Le Meridien Hotel held a rally on Thursday, April 4, 2013 in front of Cambridge City Hall, then marched to the hotel, located in Central Square. They have been calling for a boycott for the hotel since October. Members of Unite Here Local 26, which include MIT cafeteria workers, also participated in the rally.

Following a “reflection” held on Kresge Lawn Wednesday afternoon, members of the MIT community sign cards for hospitals and first responders to the Boston Marathon tragedy. The reflection, hosted by Students at MIT Allied for Student Health (SMASH), featured speeches by Chancellor Eric Grimson PhD ’80 and Institute Chaplain Robert Randolph.

MIT police officers place the casket of their fallen colleague down.

Vice President Joseph Biden spoke at Sean Collier’s memorial service on Wednesday.

Members of the MIT community joined law enforcement officials at the memorial for Sean Collier Wednesday on Briggs Field.

The MIT community joined law enforcement officials at the service.

Members of the Irish American Police Officers Association of Massachusetts play on the bagpipes in honor of Sean Collier.

Vice President Joe Biden spoke at the memorial service on Wednesday. Other notable guest included Massachusetts Governor Deval Patrick, singer-songwriter James Taylor, and Massachusetts Senator Elizabeth Warren.

The Department of Mathematics is moving to buildings E17 and E18 due to construction.

Children and adults played with musical instruments at the Instrument Petting Zoo during the Berklee BeanTown Jazz Festival held in Boston this past Saturday.