BW Sequence (IMAGE) Penn State Caption This is a sequence of black and white images of sprite initiation on July 20, 2012. Credit H. H. C. Stenbaek-Nielsen Usage Restrictions non commercial use 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.