Amazon.com description: Product Description: This annual update, the first supplement to the 20-volume McGraw-Hill Encyclopedia of Science & Technology, Seventh Edition, presents summaries of some of the most significant developments in science, technology, and engineering during the past year. This year's edition features articles on such topics as: chaos; Alzheimer's disease; recycling technology; molecular mimicry; bioremediation; environmental health; geological engineering; data compression; dinosaurs; marine archeology; book preservation; gaia hypothesis; and venus. Numerous illustrations - this year in two-colour for the first time - and bibliographies accompany every article, and cross references direct readers to related topics in both the Yearbook and the Encyclopedia.