Where did our universe come from? People have been trying to answer this question for thousands of years. The twentieth century brough new discoveries in physics and astronomy that led scientists to develop the Big Bang theory-a detailed idea that describes how our universe formed. According to this theory, the entire universe began in a single instant, in an unimaginably powerful explosion. That explosion created all time and space, all matter and...

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,...

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...

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...

"Describes the invention and development of LEGO toys. Includes glossary, websites, and bibliography for further reading"--Provided by publisher.

Simple text and illustrations explore the life of African Canadian inventor Elijah Mccoy.

"Explores the development and creation of the i-LIMB which is the first commercially available bionic hand"--Provided by publisher.

"Throughout history, from the art of camouflage to the science of stealth technology, ways have been developed to hide objects and people. Today, scientists are building an "invisibility cloak" that makes objects and people underneath it seem to disappear"--Provided by publisher.