A couple of months ago I wrote about an article which suggested that, perhaps, life on Mars might have evolved to use hydrogen peroxide as an intracellular fluid. Taking that a step further, there was a paper presented at the meeting of the American Astronomical Society in Seattle which supposed that if life were on Mars, and did use hydrogen peroxide as part of its intracellular fluid, then the Viking experiments to find life on Mars would have actually killed it, rather than identifying it. Lets hope NASA takes the time to think through the possibility and tries to find this type of life next time they send a probe to Mars.