Our special coverage of the closest race for years
Explore the personal stories of Syrian refugees in Lebanon
03 Dec 2010 04:03 GMT | Environment
Nasa scientists are putting their ideas of life back under the microscope, after a surprising discovery in California.
They found an organism whose basic building blocks include arsenic, a substance that is poisonous to most things living on Earth. And that's making them re-think what organisms need to survive - here on earth, and elsewhere.Al Jazeera's Jesse Mesner-Hage reports.
Source: Al Jazeera
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