Bryan Sykes follows up The Seven Daughters of Eve with the equally challenging and well-written Adam's Curse. This time, instead of following humanity's heritage back to the first women, Sykes looks forward to a possible future without men. The seeds of the book's topics were sown when Sykes met a pre-eminent pharmaceutical company chairman who shared his surname. Using the Y chromosome, which is passed nearly unchanged from father to son, the author found that he shared a distant ancestor with the other Sykes. Along the way, he discovered that the Y chromosome was worth examining more closely. The first third of Adam's Curse is devoted to a clear and comprehensive lesson about genetics, the second narrates several fascinating stories of tracing ancestry via the Y chromosome, and the last chapters explore the history of male humanity and its future. Some readers will eagerly skim until they reach Chapter 21, where Sykes gets to the heart of the matter--why and how the Y chromosome has created a world where men overwhelmingly own the wealth and power, commit the crimes, and fight the wars. He uses the structural puniness of the Y chromosome to demonstrate that men are as unnecessary biologically as they are dominant socially. Sykes' provocative and quite personal book is likely to be unpopular among science readers who prefer their biology divorced from sociology, but his points taken in context will be difficult to refute. --Therese Littleton