Year in review: Microbe discoveries spur rethink of treetop of life
Scientists consider deep history of eukaryotes
LIFE STORIES DNA samples of microbes discovered near hydrothermal vents like this one in the Arctic Mid-Ocean Ridge may be the closest kin yet known to complex life.
R.B. PEDERSEN/CENTRE FOR GEOBIOLOGY/UNIV. OF BERGEN
Microbes discovered in Arctic mud could be the closest relatives yet found to the single-celled ancestor that swallowed a bacterium and made life so complicated.