Thank You Note Code Hour (IMAGE) DOE/Argonne National Laboratory Caption As shown with this thank-you card, Concord Elementary School’s students enjoyed Ghadar’s visit for Hour of Code. Credit (Image by Argonne National Laboratory.) Usage Restrictions Original content License Original 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.