In December 2010, a study led by a NASA astrobiology fellow claimed to have found an alien-like microbe in a salty, alkaline lake in California. This extraordinary bacterium could reportedly thrive using the toxic element arsenic in place of phosphorus—otherwise thought essential for life on Earth. It even incorporated arsenic, instead of phosphorus, into the backbone of its DNA, according to the study, which was published online by the prestigious journal Science.
If true, the claims were groundbreaking. And NASA's press team only hyped the potential significance. In press materials, the agency claimed the finding "begs a rewrite of biology textbooks" and "will impact the search for evidence of extraterrestrial life." In a subsequent press conference, the lead author, Felisa Wolfe-Simon, didn't hold back, either, saying, "We've cracked open the door to what's possible for life elsewhere in the universe and that's profound."
Backlash
But upon that very splashy debut, outside scientists quickly identified flaws and problems in the study. When the study finally appeared in the June 3, 2011, print issue of Science, it was accompanied by eight "technical comments" blasting the study claims.