This is way cool. Even though it isn’t aliens.
If you want serious coverage, go to Ed Yong and Carl Zimmer, who explains the skeptical point of view.
Additional: More criticism of the paper.
Reference
Wolfe-Simon F, Switzer Blum J, Kulp TR, Gordon GW, Hoeft SE, Pett-Ridge J, Stolz JF, Webb SM, Weber PK, Davies PCW, Anbar AD, & Oremland RS. 2010. A bacterium that can grow by using arsenic instead of phosphorus. Science. DOI: 10.1126/science.1197258
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