Semiconductor Tetrapods (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Artificial molecules consisting of a cadmium-selenide quantum dot core and four cadmium sulfide arms, with the fourth arm sticking out of the plane and appearing as a black dot in the center of each tetrapod. Credit courtesy of Alivisatos research group 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.