"Expanded with two new issues"--Cover.

Includes bibliographical references and index.

Does politics come before science in current government decision making? -- Should government restrict the publication of unclassified but "sensitive" research? -- Should the Internet be neutral? -- Should society act now to halt global warming? -- Is it time to revive nuclear power? -- Will hydrogen replace fossil fuels for cars? -- Do falling birth rates pose a threat to human welfare? -- Is there sufficient scientific research to conclude that cell phones cause cancer? -- Should DDT be banned worldwide? -- Should potential risks slow the development of nanotechnology? -- Are genetically modified foods safe to eat? -- Should we expand efforts to find near-Earth objects? -- Will the search for extraterrestrial life ever succeed? -- Is "manned space travel" a delusion? -- Does the Internet strengthen social connections? -- Does the spread of surveillance technology threaten privacy? -- Should the world's libraries be digitized? -- Is the use of animals in research justified? -- Is it ethically permissible to clone human cells? -- Is wind power greeen? -- Are "space sunshades" a possible answer to global warming?