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NASA's next-generation telescopes will be better able to scan the cosmos for signatures of life on habitable worlds. But alien life doesn't necessarily mean intelligent – or even multicellular – beings.
A single gene in a multicellular alga could offer clues for the genetic origins of the sexes.
As permafrost thaws, it changes the composition of vegetation in the Arctic. This could accelerate global warming, say scientists
More than 40 years after passage of the Clean Water Act, US waterways still face significant challenges. However, several cleanup success stories offer hope that remediation is possible.
Scientists have coaxed back to life moss that had been frozen on an Antarctic island for more than 15 centuries.
Scientists have revived a 30,000-year-old giant virus found in Siberia, which they say affects amoebas and poses no threat to humans or animals.
A rock originating on Mars that fell to Earth during the Stone Age contains carbon-rich spheres and tunnels, possibly suggesting the presence of microorganisms on the Red Planet millions of years ago.
A single-celled organism might have killed the scores of marine animals preserved as fossils in Chile's Atacama Desert, say scientists.
Mars rover Opportunity, the older cousin of Curiosity, celebrated nearly 10 years on the planet by finding ancient clays that signal the presence of water that was neither too acidic nor too salty.
Cyanobacteria, among the first single-celled organisms to inhabit this planet, continuously release vesicles into the ocean. These vesicles are source of nourishment for other marine organisms