NASA scientists have discovered an entirely new form of life that shares no biological building blocks with anything currently known on Earth, the agency said today.

In a press conference held at NASA's Washington D.C. headquarters, scientists announced that they had discovered a new form of bacteria, known as GFAJ-1, in California's Mono Lake that has DNA completely foreign to anything ever before found on Earth. It substitutes arsenic at the DNA level for phosphorus.

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