Pack Mentality (image) University of Pittsburgh Share Print E-Mail Caption Catalase-coated, movable sheets acting together can capture particles that individual sheets alone cannot. Inward fluid flows become even stronger (indicated by larger arrow sizes) as the sheets aggregate. Credit Abhrajit Laskar/Anna Balazs Usage Restrictions None Share Print E-Mail 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.