As the last decade has shown, ideological polarization in Congress has reached historic levels. Yet, spatial theory has become increasingly important for how scholars understand Congress and legislative elections. In spatial models, candidates select positions along an ideological spectrum, and voters choose candidates based on those locations. However, the central tendency of these models is for the candidates to converge to the location of the median voter, so polarization has become increasingly problematic for spatial theory, even as scholars have come to rely increasingly on these models. In Incremental Polarization, Justin Buchler provides a unified spatial model of legislative elections, parties, and roll call voting to explain the development of polarization in Congress. His model moves beyond elections and factors in legislators' roll call voting, where a different but related spatial process operates. By linking these models, Incremental Polarization fills a critical gap in our understanding of the strategic, electoral, and procedural roots of polarization-and the role that parties play in the process.

IAU Symposium Number 52 on Interstellar Dust and Related Topics was held at Albany, N.Y., on the campus of the State University of New York at Albany from May 29 to June 2, 1972. The members of the Organizing Committee were: Dr A. D. Code, University of Wisconsin, Madison, Wis., U.S.A. Dr B. D. Donn, Goddard Space Flight Center, Greenbelt, Md., U.S.A. Dr A. Elvius, Stockholm Observatory, Saltsjobaden, Sweden. Dr T. Gehrels, Lunar and Planetary Laboratory, University of Arizona, Tucson, Ariz., U.S.A. Dr J. M. Greenberg (Chairman), State University of New York at Albany, Albany, N.Y., U.S.A. Dr H. C. van de Hulst, Sterrewacht, Leiden, Holland. Dr S. B. Pikel'ner, Sternberg Astronomical Institute, Moscow, U.S.S.R. Dr E. E. Salpeter, Cornell University, Ithaca, N.Y., U.S.A. Dr B. E. Turner, National Radio Astronomy Observatory, Charlottesville, Va., U.S.A. The suggestion was first made in 1971 that a symposium on interstellar grains would be timely. The response to the first preliminary announcement, which was sent out on November 29, 1971, was well beyond our expectations. The meeting was locally sponsored by the State University and by Dudley Observatory. The National Aeronautics and Space Administration and the National Science Foundation con tributed along with the IAU. There were 158 participants of whom 49 were from 15 countries outside the United States. A total of 92 papers were presented.

Extreme polarization in American politics--and especially in the U.S. Congress--is perhaps the most confounding political phenomenon of our time. This book binds together polarization in Congress and polarization in the electorate within an ever-expanding feedback loop. This loop is powered by the discipline exerted by the respective political parties on their Congressional members and district candidates and endorsed by the voters in each Congressional district who must choose between the alternatives offered. These alternatives are just as extreme in competitive as in lop-sided districts. Tight national party discipline produces party delegations in Congress that are widely separated from one another but each ideologically narrowly distributed. As district constituencies become more polarized and are egged on by activists, parties are further motivated to move past a threshold and appeal to their respective bases rather than to voters in the ideological center. America has indeed acquired parties with clear platforms--once thought to be a desirable goal--but these parties are now feuding camps. What resolution might there be? Just as the progressive movement slowly replaced the Gilded Age, might a new reform effort replace the current squabble? Or could an asymmetry develop in the partisan constraints that would lead to ascendancy of the center, or might a new and over-riding issue generate a cross-cutting dimension, opening the door to a new politics? Only the future will tell.

Written by an experienced teacher and author, this must-have source for work with polarimetric equipment and polarimetry in astronomy conveys the knowledge of the technology and techniques needed to measure and interpret polarizations. As such, this monograph offers a brief introduction and refresher, while also covering in detail statistics and data treatment as well as telescope optics. For astronomers, physicists and those working in the optical industry.

America is "currently fighting its second Civil War." Partisan politics are "ripping this country apart." The 2016 election "will go down as the most acrimonious presidential campaign of all." Such statements have become standard fare in American politics. In a time marked by gridlock and incivility, it seems the only thing Americans can agree on is this: we're more divided today than we've ever been in our history. In Unstable Majorities Morris P. Fiorina surveys American political history to reveal that, in fact, the American public is not experiencing a period of unprecedented polarization. Bypassing the alarmism that defines contemporary punditry, he cites research and historical context that illuminate the forces that shape voting patterns, political parties, and voter behavior. By placing contemporary events in their proper context, he corrects widespread misconceptions and gives reasons to be optimistic about the future of American electoral politics.

A wide variety of biomedical photonic technologies have been developed recently for clinical monitoring of early disease states; molecular diagnostics and imaging of physiological parameters; molecular and genetic biomarkers; and detection of the presence of pathological organisms or biochemical species of clinical importance. However, available in

"AMERICAN POLITICS IS AT a breaking point. This became obvious when a mob of American citizens, upset with the results of the 2020 presidential election, stormed the Capitol Building in Washington, D.C. to stop Congress from tabulating the election results. In order to work, democracies require citizens who respect the rights of individuals, defer to the outcomes of elections, and abide by the rule of law, but today's toxic political culture has caused many Americans to abandon these vital norms. Ideological tribalism and partisan hatred have become so rampant that frightening numbers of American citizens countenance violence against their political opponents to get their way"--

Since the discovery of transcranial magnetic stimulation (TMS) and transcranial electrical stimulation (tES), these non-invasive brain stimulation (NIBS) techniques have been used to investigate the state of cortical excitability, and the excitability of the cortico-cortical and corticospinal pathways. In addition, these techniques have been found to induce neuroplasticity—a significant breakthrough in our understanding of the brain at work. Transcranial Brain Stimulation presents a wide range of possible brain stimulation applications and discusses what new information can be gained from using this technique on the dynamics of brain functions, hierarchical organization, and effective connectivity. Implications of recent findings related to the therapeutic application are discussed by an international group of leading experts, who present practical guidance on the use of each technique, and catalog the results of numerous TMS and tES studies on biological and behavioral effects.