Cross Sections (IMAGE) University at Buffalo Caption An illustration shows cross sections of two largely spherical nanoparticles before and after they collided at 31 meters per second in a computer simulation. Individual atoms within the particles are depicted as tiny dots. Scientists studying nanoparticle collisions generated images like these for many different crash types, such as those involving different velocities and different nanoparticle shapes. Credit Yoichi Takato Usage Restrictions This image may only be used with news stories discussing the research described in the associated press release. 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.