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What may be the oldest complete fossil on Earth paints a smelly but colorful picture of our microbial ancestors from nearly 3.5 billion years ago.

The fossil is the remains of what once was a slimy, smelly, purple-and-green mat of single-celled microbes that worked, lived and even communicated in what was a lot like a prehistoric microscopic society.

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PHOTO GALLERY (CLICK TO ENLARGE)