Butterflies are disappearing at an "alarming" rate, warns new research. More than one in five butterflies in the United States has disappeared since 2000, say scientists. And the largest-ever analysis ...
A mysterious U.S. robo-warship able to spend months at sea without humans has been unveiled. The USX-1 Defiant was officially launched this week by DARPA, the research and development agency of the ...
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