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Finding the Past
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A Long Trek to Asia
Your inner Neandertal
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Food and Nutrition
Building a Food Pyramid
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Turning to Sweets, Fats to Calm the Brain
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GSAT Exam Preparation Jamaica
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A Change in Leaf Color
Black Mamba
Copperhead Snakes
Space and Astronomy
No Fat Stars
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Gravity Tractor as Asteroid Mover
Technology and Engineering
Spinach Power for Solar Cells
Reach for the Sky
Machine Copy
The Parts of Speech
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Killer Space Rock Snuffed Out Ancient Life

Long before dinosaurs ever lived, Earth suffered a major catastrophe that wiped out most life on the planet. About 250 million years ago, 95 percent of species in the oceans died out, along with 70 percent of species on land. New research may help explain what happened. Scientists are already pretty sure that a huge meteor wiped out dinosaurs 65 million years ago. There's some evidence from China, Japan, and other places suggesting that a similar impact may have occurred 250 million years ago. The newest evidence comes from Antarctica. Researchers at the University of Rochester in New York used magnets and other equipment to extract pieces of metal and minerals from Antarctic dirt that is 250 million years old. Analyses showed that particles in the dirt must have come from outer space. Amounts of iron, nickel, and other materials exactly match the composition of a type of meteorite that formed about 4.5 billion years ago. That's around the time that our solar system was born. The discovery doesn't necessarily prove that a meteor caused mass extinctions 250 million years ago. It only shows that they happened at around the same time. Still, it now seems clear that big meteors can spell big trouble for life on earth. Luckily for us, such collisions are extremely rare!—E. Sohn

Killer Space Rock Snuffed Out Ancient Life
Killer Space Rock Snuffed Out Ancient Life

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