http://www.bris.ac.uk/news/2008/212017945233.html http://www.bristol.ac.uk/aerospace/research/dynamicsandsystems/kofels/kofelsimpactbook.html I imagine we'll hear more of this if it's on the up & up. Jack -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist