Happiness (IMAGE) Aalto University Caption Happiness ‘lights up’ similar areas on both modern and ancient body maps, with the exception of the liver, which was more significant for the ancient Mesopotamians. Figure: Modern/PNAS: Lauri Nummenmaa et al. 2014, Mesopotamian: Juha Lahnakoski et. al 2024. Credit Figure: Modern/PNAS: Lauri Nummenmaa et al., Mesopotamian: Juha Lahnakoski. Usage Restrictions Please credit License Licensed 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.