As a humble gesture of thanks to the efforts by the Homework Helpers and Science Advisors, Physics Forums will be giving them the chance to win one of four $25 Amazon.com gift cards. Two will go to the Homework Helpers and two given to the Science Advisors. All they need to do is visit PF between now and Christmas Day to be eligible. On Dec 26th I'll award the gift cards at random. Winners will be notified via PM. Thanks!!