sentences:  In 2017, Falk coauthored a study with Charles Hildebolt on warfare in small-scale and state societies, which found that people are no less violent today than they were in the past.Falk coauthored a 2018 book on Asperger's syndrome with her 24-year-old granddaughter who has Asperger's, and, in 2019, published a refutation of the allegation that Hans Asperger was a Nazi sympathizer.This was in turn refuted by the original author, Herwig Czech, who opined that Falk's paper abounded "with mistranslations, misrepresentations of the content of sources, and basic factual errors, and omits everything that does not support the author’s agenda of defending Hans Asperger’s record."