NASA's new life form: Underwhelming?

Scientists have found an organism unlike anything else on earth — triggering great excitement in certain quarters. But was the discovery oversold?

 The microorganism found in California is able to reproduce using the toxic chemical arsenic.
(Image credit: NASA)

NASA has discovered a new form of life. No, it's not an alien, but a new kind of organism here on earth. Scientists have long assumed that six "building blocks" are essential for life: Carbon, hydrogen, oxygen, nitrogen, sulphur, and phosphorous. But NASA has discovered a microbe in California's Mono Lake that can use arsenic, not phosphorous, as one of its six "blocks." Given the hype over NASA's announcement, some were nonplussed by the news. What's the real significance of this discovery?

It changes everything: This is an enormous deal, says Jesus Diaz at Gizmodo. Every science textbook ever written will tell you that every being on earth, "from the smallest amoeba to the largest whale," is made of the same elements. "But not this one." This changes "our understanding of life itself."

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