Replica plaquettes (IMAGE) University of York Caption Photograph showing ambient light levels and the position of replica plaquettes in relation to the fire (during experiment E). Credit Needham et al., 2022, PLOS ONE, CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/) Usage Restrictions Please publish in relation to this story only with caption and credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.