单词:Exacum tetragonum
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This is Scientific American Sixty Seconds Science, I'm Sophie Bushwick, got a minute? When Mexican tetra fish moved into darker caves long ago, they evolved to deal with the dark by becoming albino and going blind. A new research shows that the chang
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Yakima is a small city located an hour and a half's drive(1) from Wenatchee. It is a wide valley, famous for its grapes and apples. We were there last weekend for a baseball tournament, the first of the season(2). One interesting fact about Yakima is
THIS IS AMERICA - White Sands National Monument: A Wonder of Nature, in New Mexico By Shelley Gollust Broadcast: Monday, September 19, 2005 (MUSIC) ANNOUNCER: Welcome to THIS IS AMERICA IN VOA Special
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10 Getting The Lead Out 第十章 把铅撵出去 In the late 1940s, a graduate student at the University of Chicago named Clair Patterson (who was, first name notwithstanding, an Iowa farm boy by origin) was using a new method of lead isotope measur