BLOCK 1 (IMAGE) Rice University Caption A reconstruction of block copolymers as seen through an electron microscope clearly shows how they follow the chirality, or handedness, established by their basic molecules and grow into spiraling structures that twist left or right. Their controllable 'handed-ness' and tunability could lead to materials with unique optical qualities. Credit Rong-Ming Ho/ National Tsing Hua University Usage Restrictions None License Licensed 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.