This booklet is about the disposal of high-level nuclear waste in the United States with a particular focus on Yucca Mountain, Nevada as a repository site. Intended for readers who do not have a technical background, the booklet discusses why scientists and engineers think high-level nuclear waste may be disposed of safely underground. An introduction describes why Yucca Mountain is being studied and provides basic information about those studies. The contents present the following information: (1) What is nuclear waste?; (2) what spent fuel is; (3) the legislation governing high-level nuclear waste disposal; (4) the federal program for collecting data on a potential repository site; (5) what scientists will study in regards to site selection of a repository; (6) the movement of water; (7) studying the movement of rock; (8) how the repository would affect quality of life; (9) the licensing process as governed by the U.S. Nuclear Regulatory Commission; (10) which experts review the Department of Energy (DOE) studies; (11) repository description; (12) description of the "life cycle" of spent fuel; (13) preparing waste for shipping; (14) what happens when the repository is full; (15) plans for radiation protection; (16) hazards of repository radiation; (17) factors that increase or decrease exposure to radiation; (18) radiation dose to nearby people; (19) Americans' average personal radiation exposure; (20) plans for safe transportation; (21) shipping nuclear waste by road, rail, or combination of the two; (22) state and local government involvement; (23) DOE and communication with the public; (24) challenges involved with a repository; and (25) answers to some frequently asked questions. (MCO)