Walking a fine scientific line: the extraordinary deeds of Dutch neuroscientist C. U. Ariëns Kappers before and during World War II.

Dutch neuroscientist Cornelius Ubbo Ariëns Kappers is famous for pioneering neuroembryological work and for establishing the Amsterdam Central Institute for Brain Research. Less well known is his anthropological work, which ultimately played a role in saving Dutch Jews from deportation to their deaths during the Holocaust. Ariëns Kappers extensively campaigned against anti-Semitism and Nazi persecution during the 1930s. During World War II, he utilized his credentials to help create anthropological reports "proving" full-Jews were "actually" partial- or non-Jews to evade Nazi criteria, and at least 300 Jews were thus saved by Ariëns Kappers and colleagues. His earlier work demonstrating differences between Ashkenazic and Sephardic Jewish skull indices became the focus of an attempt to save hundreds of Dutch Portuguese Jews collectively from deportation. Ariëns Kappers and colleagues brilliantly understood how anthropology and neuroscience could be utilized to make a difference and to save lives during a tragic era.