A tiny scrap of genetic information determines our sex; it also consigns many of us to a life of disease, directs or disrupts the everyday working of our bodies, and forces women to live as genetic chimeras. The culprit--so necessary and yet the source of such upheaval--is the X chromosome, and this is its story. An enlightening and entertaining tour of the cultural and natural history of this intriguing member of the genome, The X in Sex traces the journey toward our current understanding of the nature of X. From its chance discovery in the nineteenth century to the promise and implications of ongoing research, David Bainbridge shows how the X evolved and where it and its counterpart Y are going, how it helps assign developing human babies their sex--and maybe even their sexuality--and how it affects our lives in infinitely complex and subtle ways. X offers cures for disease, challenges our cultural, ethical, and scientific assumptions about maleness and femaleness, and has even reshaped our views of human evolution and human nature.

In The Expedition of Cyrus, the Western world's first eyewitness account of a military campaign, Xenophon told how, in 401 B.C., a band of unruly Greek mercenaries traveled east to fight for the Persian prince Cyrus the Younger in his attempt to wrest the throne of the mighty Persian empire from his brother.

With this first masterpiece of Western military history forming the backbone of his book, Robin Waterfield explores what remains unsaid and assumed in Xenophon's account—much about the gruesome nature of ancient battle and logistics, the lives of Greek and Persian soldiers, and questions of historical, political, and personal context, motivation, and conflicting agendas. The result is a rounded version of the story of Cyrus's ill-fated march and the Greeks' perilous retreat--a nuanced and dramatic perspective on a critical moment in history that may tell us as much about our present-day adventures in the Middle East, site of Cyrus's debacle and the last act of the Golden Age, as it does about the great powers of antiquity in a volatile period of transition.

Just as Xenophon brought the thrilling, appalling expedition to life, Waterfield evokes Xenophon himself as a man of his times—reflecting for all time invaluable truths about warfare, overweaning ambition, the pitfalls of power, and the march of history.

Beyond the range of optical perception--and of ordinary imaginings--a new and violent universe lay undetected until the advent of space exploration. Supernovae, black holes, quasars and pulsars--these were the secrets of the highenergy world revealed when, for the first time, astronomers attached their instruments to rockets and lofted them beyond the earth's x-ray-absorbing atmosphere.

The X-Ray Universe is the story of these explorations and the fantastic new science they brought into being. It is a first-hand account: Riccardo Giacconi is one of the principal pioneers of the field, and Wallace Tucker is a theorist who worked closely with him at many critical periods.

The book carries the reader from the early days of the Naval Research Laboratory through the era of V-2 rocketry, Sputnik, and the birth of NASA, to the launching of the Einstein X-Ray Observatory. But this is by no means just a history. Behind the suspenseful, sometimes humorous details of human personality grappling with high technology lies a sophisticated exposition of current cosmology and astrophysics, from the rise and fall of the steady-state theory to the search for the missing mass of the universe.