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Crack the case with George Cornelius Factor in this entertaining math adventure that introduces simplified and reduced fractions with equal parts intrigue and humor. When a valuable fraction goes missing, George Cornelius Factor (a.k.a. GCF) vows to track it down. Knowing that the villainous Dr. Brok likes to disguise his ill-gotten fractions, GCF invents a Reducer-half ray gun, half calculator- that strips away the disguise, reducing the fraction to its lowest common denominator and revealing its true form. With the Reducer in hand, George seeks out Dr. Brok in hopes of retrieving the missing fraction. Back matter includes more detail on simplifying, or reducing, fractions.

Young naturalists explore sixteen birds in this elegant introduction to the many, remarkable uses of feathers. A concise main text highlights how feathers are not just for flying. More curious readers are invited to dig deeper with informative sidebars that underscore how feathers of all shapes and sizes help birds with warming or cooling, protect them from the sun, help them swim, glide or even dig. With a range of common and exotic species readers will be engaged by both the new and the familiar. Beautiful and delicate watercolor illustrations showcase life-size feathers and compare them to everyday objects. With a scrapbook design, Feathers is part science journal, part read-along nonfiction, making it a wonderful resource for nature studies and a delight for the youngest bird lovers.

The DNA sequence that comprises the human genome--the genetic blueprint found in each of our cells--is undoubtedly the greatest code ever to be broken. Completed at the dawn of a new millennium, the feat electrified both the scientific community and the general public with its tantalizing promise of new and better treatments for countless diseases, including Alzheimer''s, cancer, diabetes, and Parkinson''s.Yet what is arguably the most important discovery of our time has also opened a Pandora''s box of questions about who we are as humans and how the unique information stored in our genomes can and might be used, making it all the more important for everyone to understand the new science of genomics. In the CURIOSITY GUIDE TO THE HUMAN GENOME, Dr. John Quackenbush, a renowned scientist and professor, conducts a fascinating tour of the history and science behind the Human Genome Project and the technologies that are revolutionizing the practice of medicine today. With a clear and engaging narrative style, he demystifies the fundamental principles of genetics and molecular biology, including the astounding ways in which genes function, alone or together with other genes and the environment, to either sustain life or trigger disease.In addition, Dr. Quackenbush goes beyond medicine to examine how DNA-sequencing technology is changing how we think of ourselves as a species by providing new insights about our earliest ancestors and reconfirming our inextricable link to all life on earth.Finally, he explores the legal and ethical questions surrounding such controversial topics as stem cell research, prenatal testing, forensics, and cloning, making this volume of the Curiosity Guides series an indispensable resource for navigating our brave new genomic world.

This easy-to-follow guide makes it simple for bug-lovers and aspiring artists alike to learn how to draw creepy crawlies of all different varieties. In step-by-step illustrations, beloved author/illustrator Ralph Masiello shows kids how to use circles, ovals, and other shapes to draw simple, lifelike portraits of their favorite insects. From a beetle to a stink bug to a caterpillar, THE BUG DRAWING BOOK offers a wide range of insects that artists can bring to life as well as an invitation for artists to create their own imaginary creepy crawlers. The simple shapes and sequenced steps will encourage both confidence and creativity for artists at any level.