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Fossil long known as world's oldest reptile dethroned
科学与环境

Fossil long known as world's oldest reptile dethroned

For nearly 30 years, a small fossil from Scotland has been celebrated as one of the earliest known reptiles. A new study out today in Nature and led by researchers at the American Museum of Natural History and the University of Oxford, in collaboration with the European Synchrotr

Phys.org - latest science and technology news stories ·

The U.S. Departs Iraq
国际新闻

The U.S. Departs Iraq

After two decades, American military forces formally withdrew from the battered nation. Our correspondent was there from the beginning.

NYT > World News ·

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科学与环境

Is the universe infinite? The answer gets weird fast

Measurements of ancient light from the cosmic microwave background suggest that the universe is remarkably flat. But that does not prove it is infinite, because the observable cosmos could be only a small patch of a much larger curved universe. Space could even be flat while wrap

All Top News -- ScienceDaily ·