Metallo-borospherene (IMAGE) Brown University Caption The family of boron-based nanostructures has a new member: metallo-borospherenes, hollow cages made from 18 boron atoms and three atoms of lanthanide elements. Credit Wang Lab / Brown 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.