We never stop learning. Check this one out about how difficult it is to make the filaments for light bulbs. Educational stuff.. :-) http://blog.makezine.com/archive/2011/03/why-its-really-really-hard-to-m ake-light-bulb-filaments.html Darwin (Dar) Piatt - W9HZC Midwest HomeBrewer's and QRP Group http://www.hbqrp.org <http://www.hbqrp.org/>