Happy flying (IMAGE) National Centre for Biological Sciences Caption The ability of flies to sustain flight for long periods of time is driven by a surge of calcium in select neurons of the brain that make the 'happy' chemical messenger, dopamine Credit Anamika Sharma Usage Restrictions None 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.