Earth and Space

 


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Blue Sky

Why is the sky blue? People have been asking this question for centuries. The generally accepted scientific explanation for blue sky was first proposed by Lord Rayleigh, a British physicist and math …


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Dinosaur Extinction

Trying to understand why the dinosaurs became extinct has become one of the great geological detective stories. Some recent findings from the small Mexican village of Chicxulub have given scientists n …


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Earthquakes

Picture it. You're sitting on the sofa watching another fun-packed episode of Newton's Apple when out of nowhere, you hear a dull roar. The room starts to shake, pictures fall off the wall, and for a …


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Echoes


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Equator

Run your finger along the equator on a globe. What do you see in your mind's eye as your finger passes over continents and oceans? Tropical rain forests? Houses on stilts? Blazing temperatures? Stop y …


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Floods

It's hard to believe that a small, slow-running stream could cause harm. During a flood, however, even the calmest brook can become a torrent and cause unforeseen misery and damage. Many people like t …


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Fog


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Galaxy Mapping

Edwin Hubble's proof that the universe is dynamic and that our Milky Way is not the lone galaxy provoked a renewal of questions and theories. Understanding the positions, distances, and distribution …


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Garbage

It's hard to imagine scientists having much to do with garbage. But as the solid waste crisis grows, simple garbage disposal will require some high-tech solutions. While getting rid of garbage has alw …


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Gems

There's nothing as eye-catching as a piece of fine jewelry covered with beautifully colored gemstones. Natural gemstones, however, are simply mineral crystals whose chemistry and structure make them l …


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