Paul Trapping in an Aqueous Solution (video) Yale University Loading video... Caption Weihua Guan and Mark Reed confine a single polystyrene bead to an accuracy of just 10 nanometers, or about 1/10,000th the width of a human hair. Credit Weihua Guan and Mark Reed/Yale University Usage Restrictions With credit given. 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.