In an underground vault enclosed by six-foot concrete walls and accessed by a rolling, 25-ton concrete-and-steel door, University of California, Berkeley, students are making neutrons dance to a new tune: one better suited to producing isotopes required for geological dating, police forensics, hospital diagnosis and treatment.

On Friday, Aug. 30, UC Berkeley held a symposium that marked the start of a yearlong initiative, “400 Years of Resistance to Slavery and Oppression,” commemorating the 400th anniversary of the forced arrival of enslaved Africans in the English colonies with a daylong symposium.