Your citation."Clean rooms are considered extreme environments for microbes because water and nutrients are in extremely short supply. Nevertheless, some bacteria are able to survive on what little moisture the low-humidity air provides and on trace elements in the wall paint, residue of cleaning solvents, and in the spacecraft materials, themselves."

When I was a kid the conventional wisdom was that nothing could live in a vacuum, nothing could live without oxygen, nothing could live above 200 degrees, etc., and so on. That them critters can survive in "clean" conditions is absolutely amazing.

Makes me think there is no doubt that there is life on Mars at some depth. Some form of life, maybe residually very, very primitive critters, but life. Which will supply Mankind with a little bit of humility. Hopefully, anyway.

Arf