该发现来自于阿姆斯特丹大学的马克•范•伍格特教授与乔安娜•范•胡芙博士，以及肯特大学博士后海伦·克劳福共同进行的一项研究。
The findings come from a study by Professor Mark van Vugt and Dr Johanna van Hooff of the University of Amsterdam, and postgraduate student Helen Crawford from the University of Kent.
海伦·凯勒的余生都致力于写作和演讲，声援盲人、聋人和其他弱势群体。
Helen Keller spent the rest of her life as a writer, lecturer, and advocate for the deaf and blind and other disadvantaged groups.
海伦忠实于她的丈夫。
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