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Front cover: "Archaea's Universe" - collage made by author. Background: combination of same field micrographs made with epifluorescence microscope using filter sets specific for DAPI (blue color) and CY3 (red color, euryarchaeota specific probe EURY499, paper IV), Valkea Kotinen Lake water sample. Center: 16S rRNA secondary structure diagram of the archaeal soil clone FFSB6 - one of the first "non-extreme" crenarchaeota sequences found in forest soil (kindly made by Dr. Robin Gutell in August 1996).