The news about a group of teenagers throwing a Nazi salute at a party in Orange County is a startling reminder that knowledge of the Holocaust is fading. Here are four free online classroom-ready activities on IWitness that address the topics of antisemitism, bystanders and hatred.

In his 104 years, B. Artin Haig witnessed both the best and the worst humanity had to offer. He saw Babe Ruth play at Yankee Stadium. He photographed President Franklin Roosevelt. And he was one of the few remaining survivors of the Armenian Genocide in North America.

Roughly 1,000 audio-only interviews recorded by students of UCLA history Professor Richard Hovannisian were entrusted to USC Shoah Foundation. This week, Hovannisian and three of his former students gave a talk about how they amassed such a large repository of memory at so crucial a time, “when denialism was huge.”

Last week a group of us from USC Shoah Foundation were in Guatemala with our testimony partner, the Foundation for Forensic Anthropology in Guatemala (FAFG). We attended the funeral of a Mayan man whose remains were recently exhumed by FAFG – 36 years after he disappeared during the genocide there.