Micro-Butterfly (image) University of Chicago Caption Researchers painted this butterfly image made out of block copolymer films using e-jet printing (electrohydrodynamic jet printing). The film consists of intricately printed components of two differing molecular weights, which display different sizes and spacing at scale of tens of nanometers (one-billionth of a meter). The butterfly at its widest diameter at the wingtips measures approximately 250 microns, the width of a few human hairs sitting snugly side by side. Credit Serdar Onses/UIUC Usage Restrictions News organizations may use this image in connection with nanotechnology research at the University of Chicago and the University of Illinois at Urbana-Champaign. 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.