SHHHHhhhh. PETA* will hear you.

NASA may have found, and killed, life on Mars.

The Viking experiments of the 1970s wouldn't have noticed hydrogen peroxide-based life and, in fact, would have killed it by drowning and overheating the microbes, said Schulze-Makuch.

* -- Yes, I know PETA stands for "People for the Ethical Treatment of Animals," and that microbes are not multicellular and therefore not animals. But I'm sure that wouldn't stop them from piping up on the issue.