My labmate just told me what the NASA press conference is going to be on at 2pm today. She said it was leaked.
I won't spoil it for my 1-2 readers.
ETA: Ok I will: (See ETA2)
It's not as cool as the gizmodo blurb.
In the paper published today, the researchers report that some of the bacteria could survive on arsenic and incorporate it into their cellular biochemistry. Instead of the usual phosphate-rich DNA, they observed arsenate-rich DNA. Heightened levels of arsenic also showed up in the cell's proteins and fats. The scientists used mass spectroscopy, radioactive labeling and X-ray fluorescence to confirm that the arsenic was really being used in the biomolecules rather than merely contaminating the cells.