Muriel Le Roux is a historian at the CNRS, at the Institut d'histoire moderne et contemporaine, a joint laboratory between the CNRS, the Ecole Normale Superieure and Paris 1 University. She heads the Committee for the History of the French Post Office. Her research interests include the history of science, technology and business.Françoise Gueritte was a chemist and INSERM senior researcher at ICSN/CNRS until her retirement in 2013. She obtained her doctorate from the University of Paris XI, and her research interests have included organic chemistry and medicinal chemistry of bioactive natural substances, particularly antitumor compounds.