Saturday was Neutrino Day at the Sanford Underground Laboratory in Lead.
As part of the annual celebration, the South Dakota School of Mines & Technology offered attendees the chance to talk live with a School of Mines scientist a mile below the Earth's surface at the lab in the former Homestake mine.
Cabot-Ann Christofferson, a chemistry faculty member serving as deputy director of the Majorana Project at Sanford lab, discussed the experiment aiming to create the purest copper in the world. The experiment is searching for evidence of neutrinoless double-beta decay, and its detection could help measure the mass of the neutrino.
Graduate students were on hand to answer questions about their underground research endeavors.
The events were free and open to the public.