Chemistry lab b-roll (VIDEO) Northwestern University This video is under embargo. Please login to access this video. Caption B-roll from the chemistry lab of study author Nathan Gianneschi. Credit Northwestern University Usage Restrictions Credit accordingly. 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.