A list of some of the hardiest organisms that inhabit inhospitable environments.
A new discovery along those lines: life buried far, far under the rubble of an ancient meteorite impact.
Added: Martian soil: good for turnips?
From PZ Myers:
Learning about life's common ancestor by examining Amphioxus.
Life's early history on Earth is tough to track down, due to several billion years of volcanic, oceanic, tectonic, and atmospheric changes. So, why not look for Earth ejecta on the moon?