Bubbles may have sheltered Earth’s early life

Signs of microbes found in 3.2-billion-year-old sandstone

microbial cells in quartz

ANCIENT CLUES  Long, narrow grooves in microcrystalline quartz appear to be the imprints of microbial cells that lived, protected from ultraviolet radiation, in bubblelike cavities 3.2 billion years ago.

Courtesy of Martin Homann, Free University of Berlin

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