No silicon-based life, but I suppose arsenic-based life is still cool too

Way back when, Captain Kirk wound up dealing with a silicon-based lifeform rather than the usual carbon-based variety. Now it seems NASA research has found arsenic-based life on this planet:

That was true until today. In a surprising revelation, 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.

Very cool.