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Light And Optics (Physics in Our World)SEVERAL THOUSAND YEARS ago people believed that vision involved the emission of some kind of radiation by the eye. Everyone realized the eyes are necessary—an eye injury causes a loss of vision—but people in ancient times imagined the eye sent out rays and bounced them off distant objects, providing a sense of vision by analyzing the... | | Atoms And Materials (Physics in Our World)JET AIRPLANES MADE their first appearance during World War II (1939–1945), almost 40 years after American inventors Orville and Wilbur Wright built and flew the first airplane. Although jet engines are powerful and efficient, early airplanes had to settle for slow, cumbersome propellers, driven by piston engines quite similar to automobile... | | 50 Battles That Changed the World
Any attempt to list the 50 most important battles in all history is necessarily
subjective. To list them in order of importance is an even greater exercise
of chutzpah. Nevertheless, people have been listing decisive battles since
Sir Edward Creasy, a lawyer who taught history, a century-and-a-half ago.
Other compilers include... |
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Lonely Planet Belize (Country Travel Guide)
“With one foot planted in the Central American jungles and the other dipped in the Caribbean Sea, Belize is home to the second-longest barrier reef in the world, jungles that teem with wildlife, and mysterious Maya ruins.” – Mara Vorhees, Lonely Planet Writer
Our Promise
You can trust... | | The Earth and the Moon (The Solar System)
The planets Mercury,Venus, Mars, Jupiter, and Saturn—all visible to the naked eye—were known to ancient peoples. In fact, the Romans gave these planets their names as they are known today. Mercury was named after their god Mercury, the fleet-footed messenger of the gods, because the planet seems especially fast moving when viewed... | | |
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