Sally M. Walker – författare

Meet an unusual family with some very special children: Alan, Ellen, Iris, Otto, and Ursula. Sometimes they''re visited by their very special aunt, Cyndy. As each child is born, the family becomes more complete—and each additional Vowel also makes the text easier to read! Because if you can imagine life without the Vowels, tlkng wld b vr hrd. Rdng wld b pzzlng. Are you ready to play the Vowel game?

In this Early Bird title, readers learn about the physical characteristics, habitat, and behavior of the mosquito.

Did witches always ride brooms? No! In fact, long, long ago, witches crept about on tiptoe. On Halloween, they would scare children and cast spells . . . but always from the ground. No witch ever thought of flying—no witch until Druscilla. Druscilla was an old witch with the loudest, creakiest knees anyone had ever heard. But she was determined not to let anything spoil her element of surprise. One Halloween, after many failed attempts at sneaking up on unsuspecting villagers, Druscilla made a discovery that changed the course of witch history.

Studying Antarctica has never been for the fainthearted."Hereabouts died a very gallant gentleman, Captain L. E. G. Oates of the Inniskilling Dragoons. In March 1912, returning from the Pole, he walked willingly to his death in a blizzard to try to save his comrades, beset by hardship."—Inscription on a cross placed near presumed final resting place of Antarctic explorer Lawrence “Titus” Oates, The Terra Nova Expedition, 1910-1913“We have one survival bag for every two people.”—Antarctic paleontologist William Hammer, Transantarctic Vertebrate Paleontology Project, 2004“When the ice cracks, it can sound like massive thunder rolls that seem to go on forever. If it is a serious cracking in the ice, it literally sounds like canon shots.”—Eighth-grade science teacher and Antarctic diver Robin Ellwood, Lake Ecosystems in Antarctica Project, 2008-2009Humanity’s fascination with the land at the bottom of the globe dates back at least to the ancient Romans, who imagined Terra Australis Incognita—the “unknown southern land”—and drew it on their maps even though no one had ever seen it. It took a thousand years for this unknown land to become known. Despite the many people who have since visited it, conquering the Antarctic frontier is a never-ending challenge that calls scientists and explorers to risk their lives in the pursuit of knowledge.Frozen Secrets is the tale of a continent, the inside story of the critical, cutting-edge research that brave men and women from around the world have done and still do in Antarctica. Sally M. Walker traces expeditions from the earliest explorers to today’s research stations, where contemporary scientists work in some of the harshest conditions on Earth.Whether they study the formation of polar ice or the stratigraphy of ancient rock or the fossils of newly discovered dinosaurs or the chemistry of air trapped in miniscule frozen bubbles, the scientists working in Antarctica are building a body of knowledge that will influence future generations as they make choices that could affect the course of the whole planet.

What do staircases, dump truck beds, and ramps have in common? All of them are inclined planes! Inclined planes are simple machines. They help us to do jobs more easily. But don''t take our word for it. Put inclined planes to the test with the fun experiments you''ll find in this book. As part of the Searchlight Books™ collection, this series sheds light on a key science question—How Do Simple Machines Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!

What do hammers, wheelbarrows, and brooms have in common? All of them are levers! Levers are simple machines. They help us to do jobs more easily. But don''t take our word for it. Put levers to the test with the fun experiments you''ll find in this book. As part of the Searchlight Books™ collection, this series sheds light on a key science question―How Do Simple Machines Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!

What do flagpoles and some window blinds have in common? They use pulleys to perform work! Pulleys are simple machines. They help us to do jobs more easily. But don''t take our word for it. Put pulleys to the test with the fun experiments you''ll find in this book. As part of the Searchlight Books™ collection, this series sheds light on a key science question―How Do Simple Machines Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!

What do jar tops and water-bottle lids have in common? Both of them are screws! Screws are simple machines. They help us to do jobs more easily. But don''t take our word for it. Put screws to the test with the fun experiments you''ll find in this book. As part of the Searchlight Books™ collection, this series sheds light on a key science question―How Do Simple Machines Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!

What do a doorstop, a butter knife, and the front of a boat have in common? All of them are wedges! Wedges are simple machines. They help us to do jobs more easily. But don''t take our word for it. Put wedges to the test with the fun experiments you''ll find in this book. As part of the Searchlight Books™ collection, this series sheds light on a key science question―How Do Simple Machines Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!

What do bicycles, doorknobs, and screwdrivers have in common? All of them use wheels and axles to perform work! Wheels and axles are simple machines. They help us to do jobs more easily. But don''t take our word for it. Put wheels and axles to the test with the fun experiments you''ll find in this book. As part of the Searchlight Books™ collection, this series sheds light on a key science question―How Do Simple Machines Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!

Electricity powers lights, computers, and television sets. But have you seen how electricity can make objects stick together? Or make other objects pull apart? Now you can! Explore electricity with the fun experiments you''ll find in this book. As part of the Searchlight Books™ collection, this series sheds light on a key science question―How Does Energy Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!

The sun, furnaces, and ovens all make heat. But have you ever watched matter expand when it is heated? Or seen how different kinds of matter conduct heat? Now you can! Explore heat with the fun experiments you''ll find in this book. As part of the Searchlight Books™ collection, this series sheds light on a key science question―How Does Energy Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!

The sun, lightbulbs, and flickering fires all bring light to our world. But have you ever watched light rays moving? Or seen how light rays reflect off objects? Now you can! Explore light with the fun experiments you''ll find in this book. As part of the Searchlight Books™ collection, this series sheds light on a key science question―How Does Energy Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!

You know that magnets hold pictures on a refrigerator. But have you ever found a magnet''s north pole? Or turned an ordinary paper clip into a magnet? Now you can! Explore magnetism with the fun experiments you''ll find in this book. As part of the Searchlight Books™ collection, this series sheds light on a key science question―How Does Energy Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!

Solids, liquids, and gases are the three states of matter. But have you ever made matter change from one state to another? Or seen how even invisible matter takes up space? Now you can! Explore matter with the fun experiments you''ll find in this book. As part of the Searchlight Books™ collection, this series sheds light on a key science question―How Does Energy Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!

People, animals, machines, and wind all make sounds. But have you ever seen how sound waves move? Or made a sound wave bounce? Now you can! Explore sound with the fun experiments you''ll find in this book. As part of the Searchlight Books™ collection, this series sheds light on a key science question―How Does Energy Work? Hands-on experiments, interesting photos, and useful diagrams will help you find the answer!

YALSA Excellence in Nonfiction for Young Adults FinalistOne of the Best Books of the Year: Chicago Public Library, School Library Journal, Science Books & FilmsBright white teeth. Straight leg bones. Awkwardly contorted arm bones. On a hot summer day in 2005, Dr. Douglas Owsley of the Smithsonian Institution peered into an excavated grave, carefully examining the fragile skeleton that had been buried there for four hundred years. "He was about fifteen years old when he died. And he was European," Owsley concluded. But how did he know?Just as forensic scientists use their knowledge of human remains to help solve crimes, they use similar skills to solve the mysteries of the long-ago past. Join author Sally M. Walker as she works alongside the scientists investigating colonial-era graves near Jamestown, Virginia, as well as other sites in Maryland. As you follow their investigations, she''ll introduce you to what scientists believe are the lives of a teenage boy, a ship''s captain, an indentured servant, a colonial official and his family, and an enslaved African girl. All are reaching beyond the grave to tell us their stories, which are written in bone.

Who could care for a bear? When Harry Colebourn saw a baby bear at a train station, he knew he could care for it. Harry was a veterinarian. But he was also a soldier in training during World War I. Harry named the bear Winnie, short for Winnipeg, his company's home town, and he brought her along to the military camp in England. Winnie followed Harry everywhere and slept under his cot every night. Before long, she became the regiment's much-loved mascot. But who could care for the bear when Harry went to battle? Harry found just the right place for Winnie-the London Zoo. There a boy named Christopher Robin played with Winnie-he could care for this bear too!

What is work? You may think work is doing chores or going to a job, but you do work every time you move something from one place to another. With experiments that demonstrate these fundamental concepts, discover how you work, and how simple machines make doing work easier.

What is work? You may think work is doing chores or going to a job, but you do work every time you move something from one place to another. With experiments that demonstrate these fundamental concepts, discover how you work, and how simple machines make doing work easier.

The first African American to break the color barrier in modern major league baseball, Jackie Robinson was one of the greatest players of all time. Forced to put up with angry, hateful fans and players when he joined the Brooklyn Dodgers, Robinson''s strength of character and perseverance allowed him to set the standard for all future players.

Where does electricity come from? How does it make a computer run or a light bulb shine? Electricity is a form of energy that can be used in many ways. Starting with the tiny particles that make up atoms—electrons, protons, and neutrons—this book highlights the basics of how electricity works and furthers understanding through a series of easy-to-do experiments.

Why do some things heat up quickly while others don’t? How can heat cause matter to change form—from solid to liquid to gas and back again? Heat cannot be seen, but it can easily be felt. Looking at different objects’ molecular makeup, this book describes the fundamentals of heat and furthers understanding through a series of easy experiments.

What is matter and where can it be found? Everything in the world is made of matter, whether it is a solid, a liquid, or a gas. Important ideas about matter such as volume, mass, and how matter changes state are conveyed through a series of easy-to-do experiments.

In 1938, off the coast of South Africa, a woman found a strange blue fish with four stubby fins, pointed spines, and a funny looking tail—it was a coelacanth! Until that very moment, the world had believed that coelacanths were extinct. Suddenly, scientists around the world were excited—could more of these unusual creatures be found and studied? Discover how scientists worked to solve the mystery of these extraordinary fish.

What a discovery! Deep under the Atlantic Ocean, divers found a shipwreck like no other. It was the H. L. Hunley, a submarine that had sunk during the Civil War! A team of scientists from all over the world came to work on the discovery. How would they raise the Hunley from the ocean floor? How would they open the submarine? And what would they find inside?

The first African American to break the color barrier in modern major league baseball, Jackie Robinson was one of the greatest players of all time. Forced to put up with angry, hateful fans and players when he joined the Brooklyn Dodgers, Robinson''s strength of character and perseverance allowed him to set the standard for all future players.

On July 28, 1996, two young men stumbled upon human bones in the shallow water along the shore of the Columbia River near Kennewick, Washington. Was this an unsolved murder? The remnants of some settler''s or Native American''s unmarked grave? What was the story behind this skeleton? Within weeks, scientific testing yielded astonishing news: the bones were more than 9,000 years old! The skeleton instantly escalated from interesting to extraordinary. He was an individual who could provide firsthand evidence about the arrival of humans in North America. The bones found scattered in the mud acquired a name: Kennewick Man. Authors Sally M. Walker and Douglas W. Owsley take you through the painstaking process of how scientists determined who Kennewick Man was and what his life was like. New research, never-before-seen photos of Kennewick Man''s remains, and a lifelike facial reconstruction will introduce you to one of North America''s earliest residents. But the story doesn''t end there. Walker and Owsley also introduce you to a handful of other Paleoamerican skeletons, exploring their commonalities with Kennewick Man. Together, their voices form a chorus to tell the complex tale of how humans came to North America—if we will only listen.