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His discoveries in 1905 would forever change our understanding of the universe. Amid the centennial hoopla, the trick is to separate the man from the math
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Fireflies' come-hither signals are being decoded by penlight-wielding biologists who've found treachery, also, in the summer-night flashes
A woodpecker feared extinct reappears in Arkansas
The Institution decides to focus on four basic questions
Raging in mines from Pennsylvania to China, coal fires threaten towns, poison air and water, and add to global warming
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It's hard enough to identify fossilized microbes on Earth. How would we ever recognize them on Mars?
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Twenty-five years ago this month, smallpox was officially eradicated. For the Indians of the high plains, it came a century and a half too late
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Eighty years after a Dayton, Tennessee, jury found John Scopes guilty of teaching evolution, the citizens of "Monkeytown" still say Darwin's for the birds
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Fifty years ago, a scientific panel declared Jonas Salk's polio vaccine a smashing success. A new book takes readers behind the headlines
The Lemelson Center celebrates a decade of nurturing the inventor in each of us
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Cristián Samper's lifelong love of flora and fauna inspires creative new displays of the world's largest collection
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Modern science, ancient catastrophes and the endless quest to predict earthquakes
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On the remote Alaskan archipelago, scientists and Aleuts are trying to find the causes of a worrisome decline in fur seals
The voracious "Frankenfish" has turned up in the Potomac River, Lake Michigan and a California lake, sparking fears of an ecological Armageddon
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When a group of Native Americans took up bison ranching, they brought a prairie back to life
Recent discoveries of skull fragments and tools testify to the resourcefulness of early humans
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A pistol-packing American scientist puts his life on the line to reduce "the most serious threat to African wildlife"
From mosquitoes to mementos, the smallest items in the Smithsonian's collections can be the most useful
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Spotted knapweed is driving out native plants and destroying rangeland, costing ranchers millions. Can anybody stop this outlaw?
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Robotic spacecraft allow geologists to explore other planets as if they were on-site
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