Kerri Pratt, National Science Foundation (IMAGE) U.S. National Science Foundation Caption Kerri Pratt, an NSF Postdoctoral Fellow in Polar Regions Research, conducts a snow-chamber experiment in -44F windchill near Barrow, Alaska. Credit Photo credit Paul Shepson, Purdue University 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.