playing of a didgeridoo is an effective treatment for obstructive sleep apnoea and snoring. Economics: Matthew Rockloff and Nancy Greer, for their experiments to see how contact with a live crocodile affects a person's willingness to gamble. Anatomy: James Heathcote, for his medical research study "Why Do Old Men Have Big Ears?" Biology: Kazunori Yoshizawa, Rodrigo Ferreira, Yoshitaka Kamimura, and Charles Lienhard, for their discovery of a female penis, and a male vagina, in a cave insect. Fluid Dynamics: Jiwon Han, for studying the dynamics of liquid-sloshing, to learn what happens when a person walks backwards while carrying a cup of coffee. Nutrition: Fernanda Ito, Enrico Bernard, and Rodrigo Torres, for the first scientific report of human blood in the diet of the hairy-legged vampire bat. Medicine: Jean-Pierre Royet, David Meunier, Nicolas Torquet, Anne-Marie Mouly and Tao Jiang, for using advanced brain-scanning technology to measure the extent to which some people are disgusted by cheese. Cognition: Matteo Martini, Ilaria Bufalari, Maria Antonietta Stazi, and Salvatore Maria Aglioti, for demonstrating that many identical twins cannot tell each other apart visually. Obstetrics: Marisa López-Teijón, Álex García-Faura, Alberto Prats-Galino, and Luis Pallarés Aniorte, for showing that a developing human fetus responds more strongly to music that is played electromechanically inside the mother's vagina than to music that is played electromechanically on the mother's belly. 2018 The ceremony took place on 13 September 2018. Medicine: Marc Mitchell and David Wartinger, for using roller coaster rides to try to hasten the passage of kidney stones. Anthropology: Tomas Persson, Gabriela-Alina Sauciuc, and Elainie Madsen, for collecting evidence, in a zoo, that chimpanzees imitate humans about as often, and about as well, as humans imitate chimpanzees. Biology: Paul Becher, Sebastien Lebreton, Erika Wallin, Erik Hedenström, Felipe Borrero-Echeverry, Marie Bengtsson, Volker Jörger, and Peter Witzgall, for demonstrating that wine experts can reliably identify, by smell, the presence of a single fruit fly in a glass of wine. Chemistry: Paula Romão, Adília Alarcão and the late César Viana, for measuring the degree to which human saliva is a good cleaning agent for dirty surfaces. Medical Education: Akira Horiuchi, for the medical report "Colonoscopy in the Sitting Position: Lessons Learned From Self-Colonoscopy." Literature: Thea Blackler, Rafael Gomez, Vesna Popovic and M. Helen Thompson, for documenting that most people who use complicated products do not read the instruction manual. Nutrition: James Cole, for calculating that the caloric intake from a human-cannibalism