Heavy metallic microswimmers (IMAGE) New York University Caption Heavy metallic microswimmers, made of rhodium (purple) and gold, swim around in a liquid solution. When confronting a sloped wall, each rod-like swimmer will reorient its body upward due to its density imbalance, and swims up like a rock climber against gravity. A hydrodynamic effect helps to amplify the action in its reorientation. Credit Image courtesy of Jun Zhang, NYU's Courant Institute and NYU's Department of Physics. Usage Restrictions In conjunction with this research only. 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.