I also don't buy the study. Further, any questioning about knowledge of Auschwitz should also include questioning about knowledge of other 20th century atrocities, such as the British suppression of the Mau Mau Uprising in Kenya, the Nanjing Massacre by the Japanese army in China, the Greek, Assyrian and Armenian Genocides under the Ottoman Empire, the Famine-Genocide in Ukraine, the expulsion and killings of Germans at the end of WWII, the Cambodian Genocide by Pol Pot and the Khmer Rouge, the East Timor and West Papua Genocides in Indonesia, the Anfal Genocide in Iraqi Kurdistan, etc. I would guess that Auschwitz is better known than most other 20th century atrocities.