NASA scientist Felisa Wolfe-Simon and her team have found a bacteria
whose DNA is completely alien to what we know today, working differently
than the rest of the organisms in the planet. Instead of using
phosphorus, the newly discovered microorganism—called GFAJ-1 and found
in Mono Lake, California—uses the poisonous arsenic for its
building blocks. Arsenic is an element poisonous to every other living
creature in the planet except for a few specialized microscopic
creatures.
NASA's geobiologist Pamela Conrad thinks that the discovery is huge and
"phenomenal," comparing it to the Star Trek episode in which the
Enterprise crew finds Horta, a silicon-based alien life form that can't
be detected with tricorders because it wasn't carbon-based. It's like
saying that we may be looking for new life in the wrong places with the
wrong methods. Indeed, NASA tweeted that this discovery "will change how
we search for life elsewhere in the Universe."

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