The Inner Belt was a proposed eight-lane highway cutting through Somerville and Central Square. The combined efforts of hundreds of activists prevented it.

What is it about Cambridge that has made it such a significant incubator for creativity in so many areas? What, the authors ask, are the ingredients in Cambridge’s “secret sauce”?

There was an extreme lack of confidence in the public school system in the 1840s. Parents feared for their children’s morality and wanted “purification” for their schools.

Today there are at least 20 cafés in Cambridge where patrons can enjoy espresso drinks. In 1959, there was exactly one. That was the year Spanish immigrant Josefina Yanguas opened Café Pamplona on Bow Street.

Cambridge is no stranger to adaptive reuse projects, which revitalize an existing structure for new purposes. One has been around since 2002; the other is opening soon.

In addition to commemorating the annual International Day of the World’s Indigenous People, there are several ways to show solidarity and support for Indigenous people.

A partnership with History Cambridge gave Harvard Summer Academy students a way to connect the past with the personal to better see themselves within a tradition of activism and change.

Learning about the Black Student Union and Sunrise Movement, and understanding how group members’ knowledge is fueled by experience, made for an eye-opening four-month fellowship.

James Printer and John Sassamon are among the many examples of Indigenous people – often apprenticed to Christian missionaries – who used assimilation to their advantage to reclaim their humanity and rights.

Since its installation in June, “Forgotten Souls” has drawn more than 1,000 viewers, History Cambridge estimates. On Saturday, the public is invited to a celebration at 159 Brattle St. for the art.