Diagram (IMAGE) Proceedings of the National Academy of Sciences Caption This is a diagram showing ice nucleating on the surface of a magnetite crystal (left) and ice failing to nucleate on a crystal in a magnetic field (right.) Credit PNAS 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.