David E. Alexander's fascination with the many animals and plants that have harnessed the air is evident in Nature's Flyers: Birds, Insects, and the Biomechanics of Flight, a detailed account of our current scientific understanding of the primary aspects of flight in nature.

Instead of relying on elaborate mathematical equations, Alexander explains the physical basis of flight with sharp prose and clear diagrams. Drawing upon bats, birds, insects, pterosaurs, and even winged seeds, he details the basic operating principles of wings and then moves progressively through more...

Why Don't Jumbo Jets Flap Their Wings? offers a fascinating explanation of how nature and human engineers each arrived at powered flight. What emerges is a highly readable account of two very different approaches to solving the same fundamental problems of moving through the air, including lift, thrust, turning, and landing. The book traces the slow and deliberate...

Most contemporary versions of moral realism are beset with difficulties. Many of these difficulties arise because of a faulty conception of the nature of goodness. Goodness, God, and Evil lays out and defends a new version of moral realism that re-conceives the nature of goodness.

Alexander argues that the adjective 'good' is best thought of as an attributive adjective and not as a predicative one. In other words, the adjective 'good' logically cannot be detached from the noun (or noun phrase) that it modifies. It is further argued that this conception of the function of the...