Books in 21st Century Science series

Combining scholarly authority with an awareness of today’s communication demands, Roget’s 21st Century Thesaurus is the simple, reliable way to find the perfect word for your needs. It features an easy-to-use dictionary format plus a revolutionary Concept Index that arranges words by idea, thus enhancing the user’s process of association and leading to scores of additional selections. The inclusion of a wide spectrum of words and phrases with each entry(from sophisticated choices to completely new vocabulary in the language(brings users an exceptional number of alternatives to fit any variation of style and tone. •Created by the highly respected Princeton Language Institute•More word choices than any other thesaurus (OVER 1 MILLION WORDS!)•Concise definitions for each main entry •A revolutionary Concept Index (arranged by idea, it mirrors the way we actually think!)•No obsolete terms (all synonyms and antonyms reflect modern usage)

Remarkable as much for the insight into our earliest ancestors as the controversies it has engendered, the concept of evolution has garnered much attention since Charles Darwin first published his theory of natural selection. Notwithstanding its detractors, evolutionary science has anticipated modern genetic research and continued to illuminate mysteries about our past and our connectedness to the species around us. Detailing the evolutionary process and speciation as well as the continuing debates about evolutions inherent validity, this engrossing volume considers all aspects of this exciting field of study.

Jonas's world is perfect. Everything is under control. There is no war or fear of pain. There are no choices. Every person is assigned a role in the community. When Jonas turns 12 he is singled out to receive special training from The Giver. The Giver alone holds the memories of the true pain and pleasure of life. Now, it is time for Jonas to receive the truth. There is no turning back.

21st Century Science is written especially for young adult readers and is designed to provide in-depth, up-to-the-minute information on the key science disciplines students need to succeed in school. Developed to closely follow state and nationlal curriculum guidelines, 21st Century Science will give students a mastery of science concepts, the scientific method, and critical thinking skills.

•Over 70,000 entries•Thoroughly revised and updated•1,000 new words and meanings•Over 400 photographs and illustrations•Expert guidance on correct usageBased on the bestselling American Heritage® Dictionary of the English Language, Fourth EditionAmerican Heritage® dictionaries are widely known as the most innovative and informative dictionaries in today's market. This all-new fourth edition of the best-selling classic continues that tradition with its clear and precise definitions, its expert usage guidance, and its wealth of illustrations. Newly updated to reflect our changing language, this revised edition is the most up-to-date and authoritative dictionary available today.•More than a thousand new entries for such terms as e-tailer, zine, bioreserve, chatroom, red card, domestic partner •More biographical and geographical entries than any other paperback, thoroughly updated for the new millennium•The most lavishly illustrated dictionary on the market -- with over 400 images•Expert usage guidance based on the American Heritage® Usage Panel•Regional notes from around the country•Hundreds of synonym lists, fascinating etymologies, and much moreAmerican Heritage® Dictionaries. Setting a new standard.

•Over 70,000 entries•Thoroughly revised and updated•1,000 new words and meanings•Over 400 photographs and illustrations•Expert guidance on correct usageBased on the bestselling American Heritage® Dictionary of the English Language, Fourth EditionAmerican Heritage® dictionaries are widely known as the most innovative and informative dictionaries in today's market. This all-new fourth edition of the best-selling classic continues that tradition with its clear and precise definitions, its expert usage guidance, and its wealth of illustrations. Newly updated to reflect our changing language, this revised edition is the most up-to-date and authoritative dictionary available today.•More than a thousand new entries for such terms as e-tailer, zine, bioreserve, chatroom, red card, domestic partner •More biographical and geographical entries than any other paperback, thoroughly updated for the new millennium•The most lavishly illustrated dictionary on the market -- with over 400 images•Expert usage guidance based on the American Heritage® Usage Panel•Regional notes from around the country•Hundreds of synonym lists, fascinating etymologies, and much moreAmerican Heritage® Dictionaries. Setting a new standard.