Catalog Search Results
1) The big bang
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Series
Formats
Description
Explains how scientists' observations of the stars led to the development of the big bang theory, a theory of how our universe was formed.
2) Relativity
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Series
Description
Since prehistoric times, people have wondered how the universe works. Early scientists studied how forces affect objects and watched how heavenly bodies move. In 1687 Isaac Newton published a set of laws that described the motion of all objects, both on Earth and in the heavens. By 1900 many physicists believed only a few questions remained to be answered. But the early 1900s brought revolutionary developments in physics. One was Albert Einstein's...
3) Germ theory
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Series
Formats
Description
Discusses how the germ theory of disease came about, how it was applied to various illnesses throughout the years, and why this theory has become so important in the field of medicine.
4) LEGO toys
Author
Series
Pub. Date
[2009]
Accelerated Reader
IL: MG - BL: 5.7 - AR Pts: 1
Description
"Describes the invention and development of LEGO toys. Includes glossary, websites, and bibliography for further reading"--Provided by publisher.
6) YouTube
Author
Series
Pub. Date
[2009]
Accelerated Reader
IL: MG - BL: 6.4 - AR Pts: 1
Description
"Describes the invention and development of YouTube. Includes glossary, websites, and bibliography for further reading"--Provided by publisher.
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Description
What is matter made of? Scientists have been trying to answer this question for thousands of years. The concept of the atom-the tiniest fragment of a substance that still retains the characteristics of that substance-goes back to the Greek philosopher Leucippus, who lived in about 450 b.c. In the mid-1600s, Robert Boyle provided experimental evidence that atoms did, indeed, exist. And in 1897, British physicist Joseph John Thomson discovered the first...
10) Cell Biology
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Description
What are cells made of? Biologists have been studying cells since the mid-1600s, when Robert Hooke viewed a slice of cork through a microscope and coined the word "cell" to describe the walled-in spaces he saw. Most cells are invisible to the naked eye. Yet they carry out the many complex processes that make life possible. As microscopes have improved, scientists have learned more and more about cells and their organelles-the structures within cells....
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Description
How are polar bears related to pandas? For thousands of years, philosophers and scientists have tried to organize and understand, or classify, the relationships among Earth's animals and plants. Early classification systems were cumbersome and inconsistent. In the late 1720s, Carl Linnaeus began developing a classification system to describe relationships among all living things, including animals, plants, fungi, and bacteria. This organization, called...
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Description
Since prehistoric times, people have been fascinated by electricity and magnetism. Ancient people marveled at the auroras-streaks of colored light that appear in the night sky near the poles. They wondered about the ability of materials such as amber and magnetite rock to attract or repel other objects. Many people believed magic was behind these phenomena. Then, in the 1600s, scientists began to lift the fog of superstition. Electricity and magnetism...
13) Evolution
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Outraged people claimed that Darwin's theory had made humans the relatives of monkeys. Scientists were sure that species changed over time, but no one could explain how. In the 1800s, Charles Darwin's studies of thousands of specimens of living things showed that no two individuals of any species were exactly alike. He realized that over millions of years, some individuals had traits that gave them an edge to survive and reproduce. As they reproduced,...
14) Genetics
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Description
If a black dog and a white dog have puppies, what color will the puppies be? Genetic scientists have been trying to answer this question for hundreds of years. Genetics is the science of heredity-how traits are passed from parents to offspring. One of the first breakthroughs came from Gregor Mendel, a nineteenth-century monk who spent eight years breeding thousands of pea plants. Pea plants might seem pretty different from dogs, but on a microscopic...
18) Plate Tectonics
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Series
Description
For hundreds of years, people found the fossils of ancient sea creatures at the tops of tall mountains. Scientists puzzled over this problem. A fish couldn't have swum up a mountain. And how could rocks on a mountain move up from the bottom of a sea? Geologists finally found the answers they needed in the 1960s, when they developed the theory of plate tectonics. This theory revolutionized our understanding of the earth. Plate tectonics explains how...
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