Photo: Journalist Peter Theo Curtis steps out of his mother's home in Cambridge, Mass., to hang up an American flag and speak with friends after being brought home from captivity in Syria - @antoinetteA
Editor's note: @NBCNews is reporting that a Cambridge, Mass., man, Stephen Silva, has been arrested on drug and gun charges and was the source of the gun that killed Sean Collier, the MIT police officer killed by the Boston Marathon bombing suspects. - Grace
Cambridge is a city in Middlesex County, Massachusetts, United States, in the Boston metropolitan area, situated directly north of the city of Boston proper, across the Charles River. It was named in honor of the University of Cambridge in England, an important center of the Puritan theology embraced by the town's founders. Cambridge is home to two of the world's most prominent universities, Harvard University and the Massachusetts Institute of Technology. Cambridge has also been home to Radcliffe College, once one of the leading colleges for women in the United States before it merged with Harvard. According to the 2010 Census, the city's population was 105,162. It is the fifth most populous city in the state, behind Boston, Worcester, Springfield, and Lowell. Cambridge was one of the two seats of Middlesex County prior to the abolition of county government in 1997; Lowell was the other.