Ross Alter, a research meteorologist at the U.S. Army Engineer Research and Development Center’s Cold Regions Research and Engineering Laboratory, spoke virtually at an event April 8, 2021, in honor of Holocaust Remembrance Day. Alter’s paternal grandfather, pictured in the PowerPoint image, was liberated at the age of 17 from Auschwitz- Birkenau, the largest concentration and extermination camp, where more than 1.1 million men, women and children were killed during the Holocaust. (U.S. Army Corps of Engineers photo by Mary Margaret Edney)