Today is the 78th anniversary of the liberation of Auschwitz-Birkenau, the largest of the Nazi death camps. On this Holocaust Memorial Day, we remember all of those who were killed in genocides across the world. The most infamous of these genocides is the Holocaust, where six million Jews were killed in death camps, alongside other marginalized groups such as the Roma, disabled people, homosexuals, and political enemies. There have been a number of other genocides across the world since 1945, including in Cambodia, Rwanda, Bosnia, Darfur, and the Uyghur genocide in China, where people have been targeted and killed based on their ethnicity or religion.