Nobel Peace Prize for the abolition or reduction of standing armies and for the holding and promotion of peace congresses". Alfred Nobel's will further specified that the prize be awarded by a committee of five people chosen by the Norwegian Parliament. Nobel died in 1896 and he did not leave an explanation for choosing peace as a prize category. As he was a trained chemical engineer, the categories for chemistry and physics were obvious choices. The reasoning behind the peace prize is less clear. According to the Norwegian Nobel Committee, his friendship with Bertha von Suttner, a peace activist and later recipient of
Nobel Prize with her husband Frédéric Joliot-Curie. In addition, the husband of Marie Curie's second daughter, Henry Labouisse, was the director of UNICEF when he accepted the Nobel Peace Prize in 1965 on that organisation's behalf. Although no family matches the Curie family's record, there have been several with two laureates. The husband-and-wife team of Gerty Cori and Carl Ferdinand Cori shared the 1947 Prize in Physiology or Medicine as did the husband-and-wife team of May-Britt Moser and Edvard Moser in 2014 (along with John O'Keefe). J. J. Thomson was awarded the Physics Prize in 1906 for showing that electrons are particles.