Water Droplet (2 of 2) (image) American Institute of Physics Caption The sharp tip of the ice drop attracts water vapor in the air, much like a sharp metal lightning rod attracts electrical charges. The water vapor collects on the tip and a tree of small ice crystals starts to grow. Credit Oscar R. Enríquez, Álvaro G. Marín, Koen G. Winkels, and Jacco H. Snoeijer, Physics of Fluids Group, University of Twente, Enschede, The Netherlands Usage Restrictions With proper credit 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.