Sound of a nut rolling inside an elastic rubber balloon Amaury Barral, Quentin Louis, Clément Brochet, Julie André, Anthony Guillen, Fang Goh, Angel Prieto and Thibault Guillet Emergent Scientist, 3 (2019) 6 Published online: 23 August 2019 DOI: 10.1051/emsci/2019005