A report on synchrotron radiation has been prepared by the Mineral Physics Committee to inform members of the Earth science community of the potentials of this powerful new tool. The report, which was prepared by W. A. Bassett, G. B. Brown, M. H. Manghnani, H. K. Mao, and L. C. Ming will be published sometime in the next few months by AGU as a separate document. The following is a summary of its contents. Anyone wanting a copy of the report should write to Customer Service at AGU.