Radiation-Resistant Logic Gates (image) University of Utah Caption These are microscopic images of two "logic gates" made of microscopic mechanical parts and thus designed to resist ionizing radiation that fries conventional silicon electronics. The top gate performs the logic function named "exclusive or" and the gate in the bottom image performs the function "and." These devices, designed at the University of Utah, are so small that four of them would fit in the cross section of a single human hair. Credit Massood Tabib-Azar, University of Utah Usage Restrictions None 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.