Rebar 2 (IMAGE) Rice University Caption Rice University graduate student Emily Hacopian holds the platform she used to study the strength of rebar graphene under a microscope. Hacopian and colleagues discovered that reinforcing graphene with carbon nanotubes makes the material twice as tough. Credit Jeff Fitlow/Rice 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.